Band device

Abstract

To provide a band device that can be attached to a retaining device, which stably responds to external pressure that uncurves the main leaf spring and quickly elastically returns to a ring state. [Solution] The band device of the present invention comprises a main leaf spring, which is formed from a strip-shaped metal plate so that its cross-section in the width direction is curved, then tempered, and not subsequently formed into a ring shape; a secondary leaf spring, which is formed from a strip-shaped metal plate into a ring shape in the longitudinal direction and then tempered; a first metal band that bundles both leaf springs at one point in the longitudinal direction and fixes to each of the leaf springs, with the ring-shaped inner surface of the secondary leaf spring facing the curved inner surface of the main leaf spring; a second metal band that bundles both leaf springs in the same way as the first metal band, but fixes only to the main leaf spring; and a coupling suction member that is attached to the curved inner surface of the main leaf spring, straddling the secondary leaf spring, and has a suction plate for suction to a catch attached to the opposite side of the secondary leaf spring.

Description

Technical Field

[0001] The present invention relates to a band device that returns to a wound state and becomes a ring shape that wraps around an object by applying an external force that promotes elastic return from a linear state, and particularly to a band device used by connecting to a trapping tool.

Background Art

[0002] Conventionally, as a band device, there has been, for example, one described in Patent Document 1. FIG. 9 shows a conventional band device described in Patent Document 1.

[0003] In FIG. 9, the band device is formed by subjecting a strip-shaped metal plate to tempering by applying a curvature with the inner side of the curvature being one surface 91a of the metal plate in the cross-section in the width direction, and then forming the metal plate into a ring shape such that the other surface side 91b of the metal plate becomes the inner side of the ring. It is configured to be maintained in a linear state by the curvature in the width direction and to elastically return from the linear state to the ring state by releasing this curvature. The main plate spring 91 and a sub-plate spring 92 formed by forming a strip-shaped metal plate into a ring shape such that one surface side 92a thereof becomes the inner side of the ring are overlapped with one surface 91a of the main plate spring 91 in a linear state facing one surface 92a of the sub-plate spring 2 in a linear state, and fixed at one location between both ends of both plate springs 91 and 92. At locations other than this fixed location 93, both plate springs 91 and 92 are wound and bundled by a metal band 94 fixed to the main plate spring 91.

[0004] Also, there has been a band device configured to be attached to a trapping tool such as a skewer.

[0005] The band device described in Non-Patent Document 1 has an adsorption plate that can be coupled to a magnet at the tip of a skewer attached to the outer curved surface of the main plate spring of the band device.

[0006] As a result, the person holding the skewer could press the band device against the object and wrap it around at a position away from the object. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2013-57385 [Non-patent literature]

[0008] [Non-Patent Document 1] Sano Kiko Co., Ltd. Cerberus SC17 Product Information (Internet)<URL https: / / www.sanokiko.co.jp / product_post / cerberus / > [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] However, in the band device described in Patent Document 1, the main leaf spring 91 is formed into a ring shape, but due to the effect of forming it in a curve, there is a large variation in the restoring force to the ring state, and it is difficult to adjust by the biasing force of the secondary leaf spring when pressure is applied in the direction of uncurving the curve.

[0010] Furthermore, when attaching the band device described in Non-Patent Document 1 to a spearhead, it is necessary to attach suction mounting plates with suction plates to both ends of the main leaf spring 91 in the width direction. This presents a problem in the manufacturing process where the suction mounting plates restrict the movement of the main leaf spring to release its curvature, resulting in defective products that cannot be released or take a long time to release the curvature.

[0011] The object of the present invention is to provide a band device that can be attached to a fastener, which stably responds to external pressure that uncurves the main leaf spring and quickly elastically returns to a ring state. [Means for solving the problem]

[0012] The band device of the present invention comprises a main leaf spring, which is formed from a strip of metal sheet so that its cross-section in the width direction is curved, then tempered, and not subsequently formed into a ring shape; a secondary leaf spring, which is formed from a strip of metal sheet so that it is ring-shaped in the longitudinal direction and then tempered; a first metal band that bundles both leaf springs together at one point in the longitudinal direction, with the ring-shaped inner surface of the secondary leaf spring facing the curved inner surface of the main leaf spring, and fixes to each of the two leaf springs; a second metal band that bundles the two leaf springs together in the same way as the first metal band, but fixes only to the main leaf spring; and a coupling suction member that is attached to the curved inner surface of the main leaf spring, straddling the secondary leaf spring, and has a suction plate for suction to a catch attached to the opposite side of the secondary leaf spring.

[0013] According to this, since the main leaf spring is not formed into a ring shape, the action of the band device changing into a ring shape when the curvature in the width direction of the main leaf spring is released is determined solely by the biasing force of the secondary leaf spring, making it easier to adjust its winding speed and force.

[0014] Furthermore, since a coupling suction member can be attached to the main leaf spring of the band device, it becomes possible to attach the band device to a restraining device such as a spear-like weapon.

[0015] Furthermore, the coupling suction member and the main leaf spring of the present invention are joined by a fixing device near both ends in the width direction of the main leaf spring, and when the main leaf spring transitions to a state where its curvature is released, the contact portion of the fixing device with the coupling suction member slides toward both ends along the elongated hole of the coupling suction member.

[0016] This prevents the propagation of the force that unwinds the curvature in the width direction of the band device from stopping or being delayed at the position of the coupling suction member when external pressure is applied to unwind the curvature at the point of external pressure. As a result, the band device can wrap around the object with the maximum restoring force of the secondary leaf spring. [Effects of the Invention]

[0017] According to the present invention, the band device adsorbed to the catcher can be wound around the object with the maximum restoring force of the sub-plate spring.

Brief Description of the Drawings

[0018] [Figure 1] (a) Plan view showing the band device in an embodiment of the present invention, (b) Front view thereof, (c) Bottom view thereof [Figure 2] (a) End view of the cut portion when the band device in an embodiment of the present invention is cut along line A-A in a linear state, (b) End view of the cut portion when the band device in an embodiment of the present invention is cut along line A-A in a state where the curvature of the main plate spring is released [Figure 3] (a) End view of the cut portion when the band device in an embodiment of the present invention is cut along line B-B, (b) End view of the cut portion when the band device in an embodiment of the present invention is cut along line B-B in a state where the curvature of the main plate spring is released [[ID=J15]] <000008J4>(a) Plan view showing a state where the adsorption mounting plate is attached to the main plate spring of the band device in an embodiment of the present invention in a curved state, (b) End view of the cut portion when cut along line C-C [Figure 5] (a) Plan view showing a state where the adsorption mounting plate is attached to the main plate spring of the band device in an embodiment of the present invention in a state where the curvature of the main plate spring is released, (b) End view of the cut portion when cut along line C-C [Figure 6] Front view showing the state of the band device in an embodiment of the present invention immediately after starting to deform into a ring state [Figure 7] Front view showing the state of the band device in an embodiment of the present invention immediately before becoming a ring state [Figure 8] Front view showing the state of the band device in an embodiment of the present invention when it has become a ring state [Figure 9] Front view showing the state of the conventional band device immediately after starting to deform into a ring state

Embodiments for Carrying Out the Invention

[0019] The present invention will be described in detail below with reference to the drawings.

[0020] Figure 1(a) is a plan view of the band device in an embodiment of the present invention, Figure 1(b) is a front view thereof, and Figure 1(c) is a bottom view thereof.

[0021] In Figures 1(a), (b), and (c), the band device 1 consists of a strip-shaped main leaf spring 10, a strip-shaped secondary leaf spring 11 that is slightly smaller than the main leaf spring 10, a long, narrow metal strip 12 that bundles the main leaf spring 10 and the secondary leaf spring 11 together, and two suction mounting plates 17 to which suction plates 15 are attached. The metal strip 12 is attached at multiple intervals along the entire length of the main leaf spring 10 to bundle the main leaf spring 10 and the secondary leaf spring 11 together. Furthermore, a rubber extension plate 18 is fixed to the main leaf spring 10, and a lead weight 19 is attached to the end opposite the joint with the main leaf spring 10.

[0022] The suction plate 15 is made of stainless steel and is designed to be attracted to the tip of a trapping tool, such as a sasumata, by magnetic force, by making the tip of the trapping tool a magnet. The suction plate 15 is not limited to stainless steel; any magnetic material is acceptable.

[0023] Furthermore, the main leaf spring 10 is made of ribbon steel, which is formed so that its cross-section in the width direction is curved, and then tempered. As a result, when the main leaf spring 10 is in a curved state, it can maintain a straight state in the longitudinal direction due to its restoring force even when pressed within the elastic limit from the inner and outer surfaces of the curve. However, if the pressure exceeds the elastic limit, the curve will be released at the pressed point.

[0024] The secondary leaf spring 11 is also made of ribbon steel, but it is formed into a ring shape in the longitudinal direction and then subjected to a tempering treatment, so that it forms a ring shape overall in a steady state.

[0025] In this embodiment, the band device 1 has a main leaf spring 10 in a curved state, with its curved inner surface and the inner surface of the ring of the secondary leaf spring 11 facing each other and in contact, and both are bundled together by a metal strip 12. At this time, the restoring force of the main leaf spring 10 to its curved state is greater than the biasing force of the secondary leaf spring 11, so the band device 1 maintains a straight state.

[0026] Figure 2(a) is a cross-section end view of the band device in this embodiment of the present invention when it is cut along line AA in this straight state. The main leaf spring 10 and the metal strip 12 are fixed together by a rivet 13 near one end of the main leaf spring 10 in the width direction, thereby maintaining the positional relationship between the main leaf spring 10 and the sub-leaf spring 11 in the width direction. This metal strip 12 corresponds to the second metal strip of the present invention. Note that hatching has been omitted on the cross-section end face of the rivet, and the same applies to the following figures.

[0027] Figure 3(a) is a cross-sectional end view of the band device in an embodiment of the present invention, when cut along the BB line in a straight state. The main leaf spring 10 and the metal strip 12 are fixed together by rivets 13 near one end of the main leaf spring 10 in the width direction, and the metal strip 12 and the sub-leaf spring 11 are fixed together by rivets 14 at the center of the sub-leaf spring 11 in the width direction. This metal strip 12 is located near one end of the band device 1, thereby maintaining the relative longitudinal positional relationship between the main leaf spring 10 and the sub-leaf spring 11. This metal strip 12 corresponds to the first metal strip of the present invention. In this embodiment, the first metal strip is located near one end of the band device 1, but it is not limited to this, and it is sufficient if it is fixed at any one location in the longitudinal direction.

[0028] Figure 4(a) shows the band device in an embodiment of the present invention in a linear state, with the suction mounting plate 16, to which the suction plate 15 is attached, mounted on the main leaf spring 10. In Figure 4(a), the suction mounting plate 16 is a 0.6 mm thick stainless steel strip for springs, and consists of a circular seat portion 22 with an elongated hole 20 in the center, and two flange portions 23 provided on the outside of the circular seat portion 22 at positions perpendicular to the elongated hole 20. Short elongated holes 21 are also drilled in these flange portions 23 in a direction perpendicular to the elongated hole 20. Furthermore, each flange portion 23 is slightly bent from the circular seat portion 22 in the direction opposite to the main leaf spring 10, and has a spring action. These flange portions 23 correspond to the end fixing portions of the present invention.

[0029] The suction plate 15 has a screw-like shape, with its shaft passing through the elongated hole 20 of the circular seat 22. It is joined to the suction mounting plate 16 by being crimped with a rivet, with a washer 15a and a washer 15b sandwiched between them from the back surface of the suction mounting plate 16, and a gap of about 0.3 mm. As a result, the suction plate 15 can slide along the elongated hole 20. The suction plate 15 attached to the suction mounting plate 16 corresponds to the suction bonding member of the present invention.

[0030] Furthermore, the suction mounting plate 16 is attached to the main leaf spring 10 with a rivet 17 passing through an elongated hole 21 in the flange portion 23, and a spacer 25 in between. The head of the rivet 17 is joined to the suction mounting plate 16 via a washer 24, with a gap of approximately 0.3 mm. This allows the rivet 17 to slide freely along the elongated hole 21 in the flange portion 23. This rivet 17, washer 24, and spacer 25 constitute the fastening device of the present invention.

[0031] Furthermore, since the flange portion 23 of the suction mounting plate 16 is slightly bent between it and the circular seat portion 22, the spring characteristics of this portion allow it to deform in a way that maintains parallelism with the main leaf spring 10.

[0032] Furthermore, since the suction plate 15 can slide along the elongated hole 20 of the circular base portion 22, when the band device of this embodiment is attached to the magnet at the tip of the spearhead, the band device can be attached to multiple types of spearheads with different tip spacings.

[0033] Now, regarding the band device 1 configured as described above, we will explain the operation and effect when an external pressure is applied in a direction that uncurves the main leaf spring 10, which is curved in the width direction and straight in the longitudinal direction.

[0034] First, when an external pressure is applied to the main leaf spring 10 in a direction that uncurves it, the biasing force of the secondary leaf spring 11 at the point where the curvature is uncurved causes the secondary leaf spring 11 to press against the main leaf spring 10 and act in a direction that causes it to wind up into a ring shape.

[0035] Figure 2(b) is a cross-sectional view of the end section when cut along line AA. The main leaf spring 10 is straight in the width direction, and the main leaf spring 10 and the sub-leaf spring 11 are in close contact due to the biasing force of the sub-leaf spring 11.

[0036] Figure 3(b) is also a cross-sectional view of the end section when cut along the BB line at this time, where the main leaf spring 10 and the sub-leaf spring 11 are in close contact.

[0037] Figure 6 is a diagram illustrating the operation of the band device 1 at this time.

[0038] In Figure 6, when an external pressure acting in a direction that uncurves the main leaf spring 10 is applied near the metal strip 12a between the two suction plates 15 of the band device 1, the uncurved state of the main leaf spring 10 propagates to the longitudinal metal strips 12b and 12c, and the main leaf spring 10 and the sub-leaf spring 11 continuously come into close contact.

[0039] Then, due to the biasing force of the sub-leaf spring 11, the sub-leaf spring 11 comes into close contact with the main leaf spring 10, and the main leaf spring 10 is wound inward, continuously changing into a ring shape up to the suction plate 15.

[0040] At this time, the suction mounting plate 16 is in the state shown in Figure 5. That is, the force that uncurves the main leaf spring 10 is transmitted, and it attempts to become straight in the width direction. However, if the joint between the rivet 17 and the suction mounting plate 16 is fixed, it will prevent the curvature from being uncurved. However, in this embodiment, the joint between the suction mounting plate 16 and the rivet 17 is an elongated hole 21 as shown in Figure 4 and can slide, so as shown in Figure 5, the joint between the rivet 17 and the suction mounting plate 16 slides through the elongated hole 21 and moves toward both ends opposite to the circular seat portion 22. In addition, the flange portion 23 can be freely deformed in relation to the circular seat portion 22, so it deforms to remain parallel to the main leaf spring 10. Because these movements can be performed without resistance, the movement that uncurves the main leaf spring 10 is further transmitted to both ends of the main leaf spring 10.

[0041] Then, as the curvature of the main leaf spring 10 is further released, the change propagates in the longitudinal direction and reaches both ends of the band device 1. As shown in Figure 7, the main leaf spring 10 and the sub-leaf spring 11 become tightly attached to both ends of the main leaf spring 10, and the overall structure continues to change to form a ring.

[0042] Here, since the extension plate 18 is fixed to the end 10b of the main leaf spring 10, the length from the external pressure point to the end of the extension plate 18 is longer than the length to the other end 10a. Furthermore, since the biasing force of the sub-leaf spring 11 does not act on the extension plate 18, the end 10b reaches the virtual circle formed by the sub-leaf spring 11 later than the end 10a. In addition, since the weight 19 is attached to the end of the extension plate 18, the end 10b of the main leaf spring 10 lags even further behind the end 10a.

[0043] This result is the same regardless of which point between the two suction plates 15 is subjected to external pressure that unwinds the widthwise curvature of the main leaf spring 10. As shown in Figure 8, after the end 10a of the main leaf spring 10 is biased by the sub-leaf spring 11 and reaches a virtual circle, the end 10b to which the extension plate 18 is attached reaches the virtual circle, and the extension plate 18 overlaps with the main leaf spring 10 on the end 10a side.

[0044] As a result, in this embodiment, when an external pressure is applied that unwinds the curvature of the main leaf spring 10 in the width direction, and the main leaf spring 10, biased by the sub-leaf spring 11, changes into a ring state, the end of the band device 1 without the extension plate 18 can change into a ring state at the maximum speed brought about by the biasing force of the sub-leaf spring 11 without resistance.

[0045] In this embodiment, the band device 1 is housed in a cover made of woven fabric or sheet, similar to conventional band devices.

[0046] As described above, in this embodiment, the main leaf spring 10 is formed so that its cross-section in the width direction is curved, and then subjected to tempering. However, unlike the conventional example, it is not formed into a ring shape after tempering. As a result, the change of the main leaf spring 10 into a ring state is determined solely by the biasing force of the sub-leaf spring 11, making it easy to adjust the winding speed and force of the band device 1 using the sub-leaf spring 11. For example, the biasing force can be easily adjusted by stacking the number of sub-leaf springs 11.

[0047] Furthermore, in conventional banding devices, depending on how the suction mounting plate 16 and the main leaf spring 10 are attached, the propagation of the action that unwinds the widthwise curvature applied to one point of the main leaf spring 10 may stop or be delayed at the position of the suction mounting plate 16. However, in this embodiment, the rivet 17 inserted into the flange portion 23 slides without resistance through the elongated hole 21 so that the flange portion 23 of the suction mounting plate 16 becomes parallel to the main leaf spring 10 as the main leaf spring 10 deforms in the widthwise direction, thus not hindering the release of the widthwise curvature of the main leaf spring 10. As a result, the main leaf spring 10 and the sub-leaf spring 11 adhere smoothly to both ends, and the action is propagated to both ends without weakening the winding speed or force of the banding device 1, allowing it to wrap around the object.

[0048] In this embodiment, only one sub-leaf spring 11 is used, but it is also possible to use multiple springs stacked together. [Industrial applicability]

[0049] As described above, the present invention is useful for band devices using a ring-shaped strip of leaf spring, and is suitable for attaching an adhesive member to a leaf spring that deforms in the width direction. [Explanation of symbols]

[0050] 1-band device 10 Main leaf spring 11. Sub-leaf spring 12 Metal strip 13, 14, 17 rivets 15 Adsorption plate 16. Suction mounting plate 18 Extension plate 19 weight 20, 21 long hole 22 Circular seat 23 Flange section 24 Washer 25 Spacers

Claims

1. A main leaf spring made from a strip of metal sheet that has been tempered after forming into a curved cross-section in the width direction, and has not been subsequently formed into a ring shape. A secondary leaf spring made by forming a strip of metal sheet into a ring shape in the longitudinal direction and then tempering it, The two leaf springs, with the ring-shaped inner surface of the secondary leaf spring facing the curved inner surface of the main leaf spring, are bundled together at one point in the longitudinal direction, and a first metal strip is fixed to each of the two leaf springs. Similar to the first metal band, the two leaf springs are bundled together, but a second metal band is fixed only to the main leaf spring, A coupling suction member is attached to the curved inner surface of the main leaf spring, straddling the sub-leaf spring, and having a suction plate for adsorption to a catch attached to the opposite side of the sub-leaf spring. A band device equipped with this device.

2. The aforementioned coupling suction member and the main leaf spring are joined by fasteners near both ends in the width direction of the main leaf spring. When the main leaf spring transitions to a state where its curvature is released, the contact portion of the fixing device with the coupling suction member slides toward both ends along the elongated hole of the coupling suction member. The band device according to feature 1.

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