Gas spring stopper
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- CAR MATE MFG
- Filing Date
- 2022-10-07
- Publication Date
- 2026-07-07
Smart Images
Figure 0007886242000001 
Figure 0007886242000002 
Figure 0007886242000003
Abstract
Description
Technical Field
[0001] The present invention relates to a stopper for a gas spring, and more particularly to a stopper suitable for maintaining the extended state of a gas spring that generates a biasing force in the extending direction and is provided to maintain the open state of a vehicle hood or back door.
Background Art
[0002] Gas springs, which are easy to handle and have a wide range of options for size and biasing force, have been used in recent years as elements for assisting the operating force in many fields, from vehicles and furniture to home appliances.
[0003] For example, in vehicles, in addition to the hood, it is also used to assist the opening and closing operations of the trunk and back door. In particular, in recent years, from the viewpoints of vehicle habitability, loading capacity, convenience, etc., hatchback-type (so-called flip-up type) vehicles that adopt large back doors such as SUVs (Sport Utility Vehicles), station wagons, minivans, and one-boxes have become popular.
[0004] The back door applied to a hatchback-type vehicle is in a state where the door body is horizontal or slightly above horizontal in the flipped-up state. Since various usage forms are conceivable for such a back door, in fact, usage forms such as attaching a carrier for loading on the outer surface or hanging luggage on the inner surface have been proposed and implemented.
[0005] However, a gas spring designed and attached so as not to require excessive force during closing while supporting the weight of the back door may become difficult to maintain the flipped-up state and may result in a situation where the open state cannot be maintained when a load is added by attaching a retrofitted carrier to the back door or hanging a lot of luggage.
[0006] To solve these problems, a back door stopper like the one disclosed in Patent Document 1 has been proposed. The back door stopper disclosed in Patent Document 1 has a stopper body that is positioned on the outer circumference of the rod portion constituting the gas spring, with one end serving as a joint fixing portion and the other end as a cylinder contact portion. Here, the joint fixing portion is an element for fixing to the joint on the tip side of the rod portion that is fixed to the back door or the vehicle body. The cylinder contact portion is an element that contacts the protruding end of the rod portion in the cylinder constituting the gas spring. The stopper body is configured to be positioned around the cylinder while maintaining the fixed state by the joint fixing portion when closing the back door.
[0007] With a back door stopper of this configuration, it is possible to maintain the open position of the back door even when a rear load is applied to it, and there is no need to remove the back door stopper when closing the back door.
[0008] However, installing a back door stopper with the configuration disclosed in Patent Document 1 requires removing the gas spring from the vehicle. Patent Document 1 also discloses a modified version that can be installed without removing the gas spring, but this modified version has the drawback that when closing the back door, the back door stopper must be removed from the gas spring, and the removed back door stopper must be stored separately. [Prior art documents] [Patent Documents]
[0009] [Patent Document 1] Japanese Patent Publication No. 2000-303736 [Overview of the project] [Problems that the invention aims to solve]
[0010] Therefore, the present invention aims to provide a gas spring stopper that can be easily attached to and detached from a gas spring, does not require a place to store it when removed, and can be applied to gas springs in various usage configurations. [Means for solving the problem]
[0011] A gas spring stopper for achieving the above objective is a stopper that suppresses the contraction of a rod portion caused by an overload on a gas spring that generates a biasing force in the direction of extending the rod portion, and comprises a first stopper piece and a second stopper piece obtained by dividing a cylindrical body in the longitudinal direction, and a hinge portion arranged along one of two dividing surfaces provided between the first stopper piece and the second stopper piece, and is characterized in that the first stopper piece and the second stopper piece are each provided with a first support piece that abuts against a joint portion located at the tip of the rod portion of the rod portion of the rod portion and cylinder portion that constitute the gas spring, a second support piece that abuts against the end surface of the cylinder portion on the side on which the rod portion protrudes, and a support piece body arranged between the first support piece and the second support piece and covering the side surface of the rod portion.
[0012] Furthermore, a gas spring stopper having the above-described features is preferably equipped with a biasing means that generates a biasing force in a direction that closes the other dividing surface provided between the first stopper piece and the second stopper piece. With these features, when the gas spring stopper is attached to the rod portion of the gas spring, the other dividing surface automatically closes and attempts to maintain the closed state. This prevents the gas spring stopper from falling off.
[0013] Furthermore, the support piece body of the gas spring stopper having the above-described features is provided with a receiving portion that converts a force acting parallel to the other dividing surface acting on it into a force that expands the other dividing surface. With this feature, it becomes possible to expand the other dividing surface and attach the gas spring stopper simply by pressing the receiving portion against the mounting position of the rod portion or cylinder portion of the gas spring. Thus, it becomes possible to further facilitate the attachment and detachment of the gas spring stopper.
[0014] Furthermore, in a gas spring stopper having the above-described features, at least one of the first stopper piece and the second stopper piece may be provided with an expanding means for expanding the other dividing surface by applying a pressing force, and the expanding means may be provided on the other dividing surface side of the hinge portion. With this feature, the operation of expanding the other dividing surface with one hand can be made easier. Thus, it becomes possible to further simplify the attachment and detachment of the gas spring stopper.
[0015] Furthermore, in a gas spring stopper having the above-described features, an anti-expansion means may be provided between the first stopper piece and the second stopper piece to prevent the other dividing surface from expanding. With this feature, even if force is applied to the receiving part, it is possible to maintain the closed state of the other dividing surface. Therefore, even if a ball joint is used in the joint part located at the tip of the rod portion constituting the gas spring, a stable mounting state of the gas spring stopper can be maintained. [Effects of the Invention]
[0016] The gas spring stopper, possessing the features described above, allows for one-handed attachment and detachment of the gas spring. Therefore, attachment and detachment are made easier. Furthermore, because it is expandable, the gas spring stopper, removed from the rod, can be placed on the cylinder. Thus, storage space for the gas spring stopper when removed is not a problem. Moreover, it can be applied regardless of the gas spring's mounting configuration, making it suitable for gas springs in various usage scenarios. [Brief explanation of the drawing]
[0017] [Figure 1] This is a perspective view showing the configuration of a gas spring stopper according to the first embodiment. [Figure 2] This figure shows the configuration of the longitudinal side surface of a gas spring stopper according to the first embodiment, where (A) is the closed state and (B) is the expanded state. [Figure 3] This is a perspective view showing the gas spring stopper according to the first embodiment attached to the rod portion of the gas spring. [Figure 4] This is a perspective view showing the configuration of a gas spring to which a gas spring stopper is attached. [Figure 5] This diagram illustrates the process of attaching a gas spring stopper to the rod portion of a gas spring. [Figure 6] This diagram illustrates the process of removing the gas spring stopper from the rod portion of the gas spring. [Figure 7] This is a perspective view showing a gas spring with a gas spring stopper attached to the cylinder portion. [Figure 8] This is a longitudinal side view showing the cylinder section with the gas spring stopper attached. [Figure 9] This is a perspective view illustrating an adapter used when a ball joint is employed at the tip of the rod section. [Figure 10]It is a perspective view showing a state in which a gas spring stopper and an adapter are attached to a gas spring employing a ball joint at the tip of a rod portion. [Figure 11] It is a cross-sectional view showing the configuration of a gas spring stopper according to the second embodiment. [Figure 12] It is a longitudinal side view showing the configuration of a gas spring stopper according to the third embodiment. [Figure 13] It is a longitudinal side view showing an example of a gas spring stopper employing a magnet as biasing means.
Embodiments for Carrying Out the Invention
[0018] Hereinafter, embodiments of the gas spring stopper according to the present invention will be described in detail with reference to the drawings. Note that the embodiments shown below are a part of preferred embodiments for carrying out the present invention, and as long as the effects are achieved, even if a part of the configuration is changed, it can be regarded as a part of the present invention.
[0019] [First Embodiment: Configuration] First, referring to FIGS. 1 and 2, the gas spring stopper according to the first embodiment will be described. In the drawings, FIG. 1 is a perspective view showing the configuration of the gas spring stopper according to the first embodiment, and FIG. 2 is a view showing the configuration of the longitudinal side of the gas spring stopper according to the first embodiment, where (A) shows the closed state and (B) shows the expanded state. In the embodiments shown below, the gas spring 100 (see FIGS. 3 and 4) provided on the back door (not shown) of a vehicle will be taken as an example for explanation. The gas spring stopper according to the present embodiment (hereinafter simply referred to as stopper 10) basically includes a first stopper piece 20, a second stopper piece 30, and a hinge portion 40. The first stopper piece 20 and the second stopper piece 30 are elements obtained by dividing a single cylindrical body in the longitudinal direction, and are provided with first support pieces 22, 32, second support pieces 24, 34, and support piece bodies 26, 36, respectively.
[0020] The first support pieces 22 and 32 are elements that abut against the joint piece 106 provided at the tip of the rod portion 102, which is one of the rod portion 102 and cylinder portion 104 that constitute the gas spring 100. In this embodiment, the first support piece 22 provided on the first stopper piece 20 and the first support piece 32 provided on the second stopper piece 30 are combined to form a cylindrical body, which constitutes the first support portion 12 of the stopper 10.
[0021] The second support pieces 24 and 34 are elements that abut against the end face 104a on the side from which the rod portion 102 protrudes, which is the longitudinal end face of the cylinder portion 104 constituting the gas spring 100. In this embodiment, the second support pieces 24 and 34, similar to the first support pieces 22 and 32, are formed by combining the second support piece 24 provided on the first stopper piece 20 and the second support piece 34 provided on the second stopper piece 30, forming a cylindrical body and constituting the second support portion 14 of the stopper 10.
[0022] The support piece bodies 26 and 36 are elements positioned between the first support pieces 22 and 32 and the second support pieces 24 and 34, which constitute the first stopper piece 20 and the second stopper piece 30, respectively. When the stopper 10 is attached to the gas spring 100 (in use), the support piece bodies 26 and 36 are positioned to cover the sides of the rod portion 102. In this embodiment, similar to the first support pieces 22 and 32 and the second support pieces 24 and 34 described above, the support piece bodies 26 and 36 are formed by combining the support piece body 26 provided on the first stopper piece 20 and the support piece body 36 provided on the second stopper piece 30 to form a cylindrical body, which constitutes the support portion body 16 of the stopper 10.
[0023] The hinge portion 40 is an element that expands or closes along the dividing surface while maintaining the engagement between the first stopper piece 20 and the second stopper piece 30, which are formed by dividing a cylindrical body in the longitudinal direction. In this embodiment, the hinge portion 40 is positioned along one of the two dividing surfaces provided between the first stopper piece 20 and the second stopper piece 30. Specifically, it is provided on the side surface of the support piece bodies 26 and 36, and is configured to allow the other dividing surface to be opened.
[0024] In the stopper 10 according to this embodiment, the hinge portion 40 is provided with a biasing means 42 that generates a force in a direction that closes the other dividing surface provided between the first stopper piece 20 and the second stopper piece 30. The form of the biasing means 42 is not limited; if the biasing means 42 is a spring, it may be a coil spring as shown in Figure 1, or a leaf spring, etc. By providing the biasing means 42, when the stopper 10 is attached to the rod portion 102 of the gas spring 100, when the other dividing surface is expanded and the rod portion 102 is placed inside the support piece bodies 26, 36, the other dividing surface will automatically close and attempt to maintain the closed state. This prevents the stopper 10 from falling off.
[0025] Furthermore, in the stopper 10 according to this embodiment, receiving portions 26a, 36a, 26b, and 36b are provided near the other dividing surface. The receiving portions 26a, 36a, 26b, and 36b are elements for converting a force (pressing force) applied to the other dividing surface in a direction parallel to the dividing surface into a force that expands the other dividing surface. In this embodiment, the receiving portions 26a, 36a, 26b, and 36b are provided near the other dividing surface on the support piece bodies 26 and 36. As shown in Figure 2, in this embodiment, the receiving portions 26a, 36a, 26b, and 36b are provided on both the outer and inner sides of the support piece bodies 26 and 36.
[0026] The form of the receiving portions 26a, 36a, 26b, and 36b is not limited, but as an example, it is good to have them as shown in Figure 2. That is, the receiving portions 26a and 36a provided on the outer side of the support piece bodies 26 and 36 should be a mountain-shaped protrusion formed by a straight edge that rises from the other dividing surface at an angle θ1 of less than 90 degrees with respect to the extension line L of the other dividing surface, and a straight edge that descends from the vertex of this straight line to the arc-shaped outer circumference that constitutes the support piece bodies 26 and 36. On the other hand, the receiving portions 26b and 36b provided on the inner side should be an inclined surface (so-called chamfer) that reduces the contact surface with the other dividing surface, and should have an angle θ2 of less than 90 degrees with respect to the straight line L. By configuring the receiving parts 26a, 36a, 26b, and 36b in this way, when a force is applied to the inclined surfaces constituting the receiving parts 26a, 36a, 26b, and 36b in a direction along the dividing surface (the other dividing surface), a component force is generated in this force, and a force in the expanding direction is applied to the first stopper piece 20 and the second stopper piece 30.
[0027] The names "first stopper piece 20," "second stopper piece 30," "first support pieces 22, 32," and "second support pieces 24, 34" are used to clearly indicate the elements that constitute the stopper 10. Therefore, it goes without saying that the stopper 10 according to this embodiment will still work even if the first stopper piece 20 and the second stopper piece 30, and the first support pieces 22, 32 and the second support pieces 24, 34 are reversed.
[0028] [Effect] The stopper 10 with the above configuration is used when the back door (not shown) of the vehicle is open, that is, when the rod portion 102 of the gas spring 100 is extended, as shown in Figure 4.
[0029] The specific usage is as follows. First, the support body 16 of the stopper 10 shown in Figure 5(A) is grasped and brought close to the rod portion 102 of the gas spring 100, and the stopper 10 is pressed against the rod portion 102 so that the receiving portions 26a and 36a are aligned with the rod portion 102 (pressing in the direction of arrow A). Since the rod portion 102 is part of the gas spring 100 fixed to the vehicle, a reaction force F1 is generated when the stopper 10 is pressed against the rod portion 102 (see Figure 5(B)). When the reaction force F1 acts on the inclined surfaces of the receiving portions 26a and 36a, component forces are generated according to the angle of the inclined surfaces, and a portion of these forces acts as a force F2 in the direction that expands the other divided surface. This action expands the other divided surface, making it possible to insert the rod portion 102 into the support piece bodies 26 and 36. The first stopper piece 20 and the second stopper piece 30 are opened when the force F2 in the direction of opening the other dividing surface exceeds the biasing force F3 (see Figure 5(C)) acting on the other dividing surface by the biasing means 42 (F2 > F3).
[0030] As shown in Figure 5(C), when the rod portion 102 crosses over the other dividing surface and intervenes on the inside side of the support piece bodies 26, 36, the force F2 in the direction of expanding the other dividing surface disappears. As a result, the biasing force F3 from the biasing means 42 closes the other dividing surface. When the other dividing surface is closed, the stopper 10 forms a cylindrical body with the rod portion 102 intervening inside, and at its longitudinal end, it forms a first support portion 12 formed by a combination of two first support pieces 22, 32 and a second support portion 14 formed by a combination of two second support pieces 24, 34 (see Figures 3 and 5(D)).
[0031] After the stopper 10 is attached to the rod portion 102 of the gas spring 100 in this manner, if the load applied to the back door exceeds the allowable support load of the gas spring 100, the rod portion 102 is pushed into the cylinder portion 104, causing the gap between the end of the cylinder portion 104 and the joint portion 106 located at the tip of the rod portion 102 to narrow. When the gap between the end face of the cylinder portion 104 and the joint portion 106 narrows, the joint portion 106 and the end face of the cylinder portion 104 come into contact with the first support portion 12 and the second support portion 14, respectively, preventing the rod portion 102 from being pushed into the cylinder portion 104. This prevents the back door from moving in the closing direction.
[0032] After using the stopper 10, as shown in Figure 6(A), while gripping the support body 16, move the stopper 10 away from the rod portion 102 by pressing the rod portion 102 against the inner receiving portions 26b and 36b (move in the direction of arrow B). By performing this operation, when the rod portion 102 is pressed against the receiving portions 26b and 36b, a pressing force F4 acts on the receiving portions 26b and 36b, and this force is converted into a force F5 that expands the other dividing surface, causing the other dividing surface to be pushed open (see Figure 6(B)). When the rod portion 102 moves beyond the other dividing surface by moving the stopper 10, the biasing force F3 from the biasing means 42 causes the other dividing surface to move in a closing direction (see Figure 6(C)). In the stopper 10 according to this embodiment, the above operation makes it possible to detach the stopper 10 from the rod portion 102, and this operation can be performed with one hand (see Figure 6(D)).
[0033] The stopper 10, after use, can be stored separately, but it can also be held on the outer circumference of the cylinder part 104 by pressing the receiving parts 26a and 36a against the cylinder part 104, as shown in Figure 7, so as to sandwich the cylinder part 104. This arrangement eliminates the need to store the stopper 10 separately, thus preventing it from being lost. In this embodiment, the stopper 10 does not have any protruding parts such as knobs on the hinge part 40 that engages the first stopper piece 20 and the second stopper piece 30, so it can be placed in narrow spaces. For this reason, the back door can be opened and closed even when the stopper 10 is attached to the cylinder part 104.
[0034] Furthermore, if the stopper 10 is positioned on the cylinder portion 104, the next time it is used, it is possible to transition to the usage state simply by sliding the stopper 10 from the cylinder portion 104 towards the rod portion 102. In order to achieve this holding configuration, when the cylinder portion 104 is clamped by the first stopper piece 20 and the second stopper piece 30, the portion clamped by the other dividing surface must be at least greater than the radius r of the rod portion 102. Specifically, when the rod portion 102 is clamped, L1 shown in Figure 8 should be greater than the radius r.
[0035] [effect] With the stopper 10 configured as described above, the gas spring 100 can be attached and detached with one hand, making attachment and detachment easier. Furthermore, when the stopper 10 is removed, it can be held in the cylinder part 104, so there is no problem with finding a place to store it when it is removed.
[0036] [Application Forms] In the above embodiment, it was stated that when force is applied to the receiving portions 26b and 36b, the other dividing surface (first stopper piece 20 and second stopper piece 30) expands. Therefore, if a ball joint as shown in Figure 9(A) is used for the joint portion 106 located at the tip of the rod portion 102 that constitutes the gas spring 100, when the rod portion 102 is about to be pushed into the cylinder portion 104, the spherical surface of the ball joint may come into contact with the receiving portions 26b and 36b, and a force may act that causes the other dividing surface to expand.
[0037] In such cases, as shown in Figure 9(B), an adapter 44 may be provided to make the surface that contacts the second support portion 14 a flat surface. The adapter 44 is a member that is placed at the tip of the rod portion 102, and its thickness should be such that it fits within the range of the rod portion 102 that is exposed from the cylinder portion 104 when the gas spring 100 is contracted. This thickness makes it possible to close the back door with the adapter 44 attached to the rod portion 102. Furthermore, the adapter 44 is not limited in its configuration as long as it is structured so that it does not fall off even when the ball joint is pressed against it from the thickness direction, i.e., the extension direction of the rod portion 102. In the example shown in Figure 9, the split member is screwed together with bolts to provide resistance to force in the expansion direction.
[0038] By attaching such an adapter 44 to the rod portion 102, as shown in Figure 10, it becomes possible to stably position the stopper 10 according to this embodiment even if the gas spring 100 employs a ball joint in the joint portion 106.
[0039] [Second Embodiment] Next, a gas spring stopper according to the second embodiment will be described with reference to Figure 11. Most of the components of the stopper 10A according to this embodiment are the same as those of the stopper 10 according to the first embodiment described above. Therefore, the same reference numerals are used in the drawings for parts with the same components, and detailed explanations are omitted. In Figure 11, Figure 11(A) shows the cross-sectional shape when the first stopper piece 20 and the second stopper piece 30 are closed, and Figure 11(B) shows the cross-sectional shape when they are opened.
[0040] The stopper 10A according to this embodiment is characterized by having an expanding means 38 on the second stopper piece 30. The expanding means 38 is an element that expands the other dividing surface by applying a pressing force in the direction of arrow C. In this embodiment, the pressing portion of the expanding means 38 is provided in a part located on the other dividing surface side of the hinge portion 40. Specifically, as shown in Figure 11, the expanding means 38 provided on the second stopper piece 30 is provided so as to penetrate a part of the first stopper piece 20.
[0041] Having these features makes it easier to operate with one hand when expanding the first stopper piece 20 relative to the second stopper piece 30. Therefore, the ease of attaching and detaching the stopper 10A can be further improved. The other configurations, operations, and effects are the same as those of the stopper 10 according to the first embodiment. Of course, the operations of the first stopper piece 20 and the second stopper piece 30 may be reversed, and an expanding means (not shown) may be provided on the first stopper piece 20, or it may be provided on both the first stopper piece 20 and the second stopper piece 30.
[0042] [Third Embodiment] Next, a gas spring stopper according to the third embodiment will be described with reference to Figure 12. Most of the components of the stopper 10B according to this embodiment are the same as those of the stopper 10 according to the first embodiment described above. Therefore, parts with the same components are denoted by the same reference numerals in the drawings, and detailed explanations will be omitted. In Figure 12, Figure 12(A) is a longitudinal side view showing the state in which the first stopper piece 20 and the second stopper piece 30 are closed and locked, and Figure 12(B) is a longitudinal side view showing the state in which the lock is released and the stopper is expanded.
[0043] The stopper 10B according to this embodiment is characterized by having a ratchet-type anti-expansion means 50 between the first stopper piece 20 and the second stopper piece 30. The anti-expansion means 50 has at least a sawtooth gear section 52 and an operating lever 54 equipped with a locking pawl 54a. The sawtooth gear 52 has an inclined side and a vertical side, and the locking pawl 54 engages with the vertical side to restrict the movement of the first stopper piece 20 and the second stopper piece 30 from expanding.
[0044] In this embodiment, a sawtooth gear 52 is positioned in the rotating part near the hinge portion 40 of the second stopper piece 30, and an operating lever 54 is positioned on the first stopper piece 20. With this configuration, by rotating the operating lever 54 in the direction of arrow D, it is possible to lock or unlock the movement of the first stopper piece 20 and the second stopper piece 30 in the expanding direction.
[0045] With this configuration, when the stopper 10B is attached to the gas spring 100, it is possible to avoid the first stopper piece 20 and the second stopper piece 30 unintentionally expanding and falling off. For this reason, even if a ball joint is used in the joint portion 106 provided at the tip of the rod portion 102 of the gas spring 100, it is not necessary to provide the adapter 44 described above. The other configurations, operations, and effects are the same as those of the stopper 10 according to the first embodiment. [Industrial applicability]
[0046] In the above embodiment, the biasing means 42 is described as being made of an elastically deformable spring material such as a coil spring or a leaf spring. However, as a means of applying a biasing force in the direction of closing the first stopper piece 20 and the second stopper piece 30, an attractive means such as a magnet may be used. If the biasing means 42 is a magnet, it is preferable to place the biasing means on elements that will be arranged opposite each other in the operating state, such as the support piece bodies 26, 36, the first support pieces 22, 32, and the second support pieces 24, 34, as shown in Figure 13. When placing the biasing means 42 on each side, the opposing biasing means 42 (magnets) should be arranged so that their pole surfaces that attract each other face each other.
[0047] In this configuration, when the first stopper piece 20 and the second stopper piece 30 are closed, an attractive force is generated between the paired biasing means 42. Therefore, a force is generated between the first stopper piece 20 and the second stopper piece 30 in a direction that closes them. Furthermore, if the rod portion 102 and cylinder portion 104 of the gas spring 100 are magnetic, a high attractive force (force that maintains the attached state) can be obtained on the rod portion 102 and cylinder portion 104 when the stoppers 10, 10A, and 10B are attached.
[0048] In the above embodiment, a gas spring 100 attached to the back door of a vehicle is given as a specific example, and the stoppers applicable to this gas spring 100 are described using the names "stopper 10, 10A, 10B". However, the gas spring stopper according to the present invention can be applied to gas springs in various forms of use, such as gas springs attached to the hood of a vehicle, furniture, and home appliances. Furthermore, it goes without saying that it can be used not only when an overload is applied, but also to maintain the posture of gas springs that have deteriorated due to gas leakage or other reasons and are no longer able to perform at their original capacity. [Explanation of symbols]
[0049] 10, 10A, 10B... Stopper, 12... First support part, 14... Second support part, 16... Support part body, 20... First stopper piece, 22... First support piece, 24... Second support piece, 26... Support piece body, 26a, 26b... Receiving part, 30... Second stopper piece, 32... First support piece, 34... Second support piece, 36... Support piece body, 36a, 36b... receiving part, 38... expanding means, 40... hinge part, 42... biasing means, 44... adapter, 50... anti-expansion means, 52... saw blade gear part, 54... operating lever, 54a... locking claw, 100... gas spring, 102... rod part, 104... cylinder part, 104a... end face, 106... joint part.
Claims
1. A stopper that suppresses the contraction of the rod portion caused by an overload on a gas spring that generates a biasing force in the direction of extending the rod portion, It consists of a first stopper piece and a second stopper piece obtained by dividing a cylindrical body in the longitudinal direction, and a hinge portion arranged along one of the two dividing surfaces provided between the first stopper piece and the second stopper piece. The first stopper piece and the second stopper piece each have a first support piece that contacts the joint portion located at the tip of the rod portion of the rod portion, which constitutes the gas spring, The cylinder portion includes a second support piece that abuts against the end face on the side from which the rod portion protrudes, A support piece body is positioned between the first support piece and the second support piece and covers the side surface of the rod portion, A gas spring stopper characterized by having a feature.
2. The gas spring stopper according to claim 1, further comprising a biasing means for generating a biasing force in a direction that closes the other dividing surface provided between the first stopper piece and the second stopper piece.
3. The gas spring stopper according to claim 2, characterized in that the support piece body is provided with a receiving portion that converts a force acting on the other dividing surface in a direction parallel to the dividing surface into a force in a direction that expands the other dividing surface.
4. At least one of the first stopper piece and the second stopper piece is provided with an expanding means for expanding the dividing surface of the other by applying a pressing force. The gas spring stopper according to claim 2 or 3, characterized in that the expanding means is provided on the other dividing surface side than the hinge portion.
5. The gas spring stopper according to claim 2 or 3, characterized in that it is provided with an expansion prevention means between the first stopper piece and the second stopper piece to prevent the other dividing surface from expanding.