This specification relates to resilient bumpers and bumper systems.
Bumpers are used to absorb shock and prevent damage when two objects collide. In some cases, the bumper is mounted to a moving object. In other cases, the bumper is mounted to a stationary object. A bumper system can include multiple individual bumpers, for example, attached to a structure, such as a pier or a building. On impact, the bumper deforms to absorb a portion of the impact energy. In some cases, this deformation is substantially irreversible, for example, for car bumpers. In contrast, resilient bumpers return substantially to their original state and are designed for repeated impact.
In general, this disclosure relates to a resilient bumper and bumper systems.
In one aspect, a resilient bumper includes an arc-shaped spring member that extends from a first end to a second end along a spring axis and includes an impact surface arranged between the first and second ends; and a support member that includes an attachment interface that extends in parallel to the spring axis of the spring member and is configured to releasably engage the first and second ends of the spring member.
Implementations may include one or more of the following features.
In some implementations, at least one of the first and second ends of the spring member are moveably mounted to the attachment interface, wherein a deflection of the spring member increases a distance between the first and second ends of the spring member along the spring axis.
In some implementations, the spring member includes a leaf spring including a spring steel, a fiber-reinforced material, a resin, a composite material, or a combination thereof. For example, the spring member can include a stacked leaf spring that includes a stack of arc-shaped spring leaves and one or more clamps to clamp the stack of spring leaves. In some implementations, each spring leaf includes a spring steel, a fiber-reinforced material, a resin, a composite material, or a combination thereof. In some implementations, the stacked leaf spring further including a flat bumper plate that forms the impact surface, wherein the clamp presses the bumper plate against the stack of spring leaves.
In some implementations, the first end of the spring member includes a first pair of rollers rotatably mounted to the first end of the spring member, and the second end of the spring member includes a second pair of rollers rotatably mounted to the second end of the spring member, wherein the first and second pair of rollers are configured to roll along a surface of the support member as the first and second ends move along the attachment interface.
In some implementations, the first end of the spring member includes a first sliding pin and the second end of the spring member includes a second sliding pin, the attachment interface includes a slot formed in a surface of the support member and configured to receive a shaft portion of each of the first and second sliding pins, and the first and second sliding pin each include a head portion connected to the shaft portion and having an outer diameter larger than a width of an opening of the slot.
In some implementations, the attachment interface includes one or more insertion openings that are sized to accommodate the head portion of the first and second sliding pins and communicate with the slot. In some implementations, the one or more insertion openings are offset laterally to the spring axis and connected to the slot by a respective connection portion.
In some implementations, the slot includes a first slot segment configured to receive the shaft portion of the first sliding pin and a second slot segment configured to receive the shaft portion of the second sliding pin, wherein the first and second slot segments are separate from one another.
In some implementations, the slot includes a hook portion that supports the first or the second sliding pin at a fixed vertical position along the spring axis.
In some implementations, the first and second pairs of rollers are received within the support member and configured to travel along an inner surface of the support member, wherein the attachment interface includes an opening through which the spring member extends.
In some implementations, the spring member includes a composite material and one or more optic fiber sensors embedded in the composite material, wherein the one or more optic fiber sensors are configured to detect the a load as the spring member deflects.
In some implementations, the support member includes one or more mounting holes for mounting the support member.
In another aspect, a bumper system includes a plurality of resilient bumpers, each resilient bumper including an arc-shaped spring member that extends from a first end to a second end along a spring axis and includes an impact surface arranged between the first and second ends, and a support member that includes an attachment interface that extends in parallel to the spring axis of the spring member and is configured to releasably engage the first and second ends of the spring member; and a frame to which the support member of each of the plurality of resilient bumpers is connected, such that the resilient bumpers are aligned along a frame axis substantially transverse to the spring axis of each resilient bumper.
Implementations may include one or more of the following features.
In some implementations, at least one of the first and second ends of the spring member are moveably mounted to the attachment interface, wherein a deflection of the spring member increases a distance between the first and second ends of the spring member along the spring axis.
In some implementations, the bumper system includes a load panel that extends along the frame axis and covers the resilient bumpers, wherein each of the spring members of the plurality of resilient bumpers includes a flat bumper configured to engage the load panel.
In some implementations, each of the spring members includes a composite material and one or more optic fiber sensors embedded in the composite material, wherein the one or more optic fiber sensors are configured to detect the a load as the spring member.
In a further aspect, a marine structure includes a plurality of resilient bumpers, each resilient bumper including an arc-shaped spring member that extends from a first end to a second end along a spring axis and includes an impact surface arranged between the first and second ends, and a support member that includes an attachment interface that extends in parallel to the spring axis of the spring member and is configured to releasably engage the first and second ends of the spring member; and a frame to which the support member of each of the plurality of resilient bumpers is connected, such that the resilient bumpers are aligned along a frame axis substantially transverse to the spring axis of each resilient bumper, wherein the frame is configured to rest on the seabed.
The details of one or more implementations of the subject matter described in this specification are set forth in the accompanying drawings and the detailed description. Other features, aspects, and advantages of the subject matter will become apparent from the description, the drawings, and the claims.
Referring to
In some cases, the arc-shaped spring member 12 can comprise a leaf spring. A leaf spring is a curved strip of resilient material that is substantially longer than it is wide. In some cases, the arc-shaped spring member 12 includes a stacked leaf spring that comprises a stack of arc-shaped spring leaves 20 and one or more clamps 22 to clamp the stack of spring leaves 20. For example, friction between the individual spring leaves 20 can provide a damping action as an object collides against the spring member 12. Instead of the clamp 22, the spring member 12 can also comprise U-bolts that maintain friction among the stack of spring leaves 20.
As illustrated in
In addition to the curved spring leaves 20, some stacked leaf springs include a flat bumper plate 24 arranged on the topmost leaf 20. The bumper plate 24 includes an outer surface 26 that forms the bumper's impact surface 15. For example, if the bumper plate 24 and the spring leaves 20 are viewed from the side, the center line of the flat outer surface 26 and the respective spring leaves meet at the crown of the spring leaves 20. In some implementations, the bumper plate 24 can also include a curved inner surface that is shaped to mate with the curved spring leaves 20. Accordingly, the bumper plate 24 can include two wedge portions 28 that transition between the flat outer surface 26 and the curved inner surface. As illustrated, the length of the bumper plate 24 along the spring axis S amounts to roughly half of the length of the spring member 12. In some cases, the ratio of the length of the bumper plate 24 to the length of the spring member 12 can be greater or smaller, e.g., ⅓ or ⅔. Although the bumper plate 24 forms the impact surface 15 in the illustrated implementation, other implementations do not necessarily include a bumper plate 24. Instead, the impact surface can be formed by the outer surface of the topmost leaf 20 at the crown of the arc, for example.
The first end 16 of the spring member 12 can include a first pair of rollers 30 that are rotatably mounted to the first end 16 of the spring member 12. The second end 18 of the spring member 12 can include a second pair of rollers 32 that are rotatably mounted to the second end 18 of the spring member 12. The first and second pair of rollers 30, 32 are configured to roll along a surface 34 of the support member 14 as the first and second ends 16, 18 of the spring member 12 move with respect to the support member 14. In the illustrated implementation, the first and second pair of rollers 30, 32 roll along the top or outer surface 34 of the support member 14. For example, the spring member 12 can include a loop 36 at each end. A bolt 38 can extend through the loop, transverse to the spring axis. A spacer 40 and each of the rollers 30, 32 can be rotatably mounted on the bolt 38. The loop 36 can be formed integrally by one of the spring leaves 20. Instead of a common bolt 38, each roller can also be mounted by a separate bolt or pin.
In some implementations, the first and second ends 16, 18 of the spring member 12 are moveably mounted to a track 17 of the support member 14 to connect the spring member 12 and the support member 14. The support member's track 17 can have various configurations that engage the first and second ends 16, 18 of the spring member 12 in different ways. For example, the first end 16 of the spring member 12 can include a first sliding pin 42 and the second end 18 of the spring member 12 can include a second sliding pin 44 (
In some cases, the slot can include a first slot segment 50 that receives the shaft portion of the first sliding pin 42 and a second slot segment 52 distinct from the first slot segment 50 that receives the shaft portion of the second sliding pin 44. In such cases, one of the slot segments 50, 52 can include a hook portion at one end that supports the first or the second sliding pin 42, 44 at a fixed vertical position along the spring axis S. In
The bumper 10 of
The assembled resilient bumper 10 can be mounted by the support member 14 to another structure and used to absorb shock and prevent damage to the structure, as explained in more detail in reference to
In some implementations, the first and second ends 16, 18 of the spring member 12 are not fixed in place, and one or both ends 16, 18 can move in response to the deflection of the spring member 12. For example, referring to
In
In some implementations, the spring member 12 can include a composite material and one or more optic fiber sensors embedded in the composite material. The optic fiber sensors can be used to detect the extent to which the spring member 12 deflects, and thus the load absorbed by the bumper 10. Such information can be processed using machine learning techniques to predict, for example, maintenance intervals.
In the implementation illustrated in
Other implementations may not necessarily include rollers 30, 32 that move across the outer surface of the support member 14. For example, the support member 14 can have a circular, elliptical, or hexagonal shape that makes such rollers 30, 32 impractical. In this case, the first and second ends 16, 18 can be connected to a slot or slot segments by sliding pins that are similar to first and second sliding pins 42, 44. Although the first and second sliding pins 42, 44 are relatively small in comparison to the size of the loops 36, the size shown in the drawing is not necessarily representative.
Thus, the resilient bumper of the present disclosure acts as an elastic machine that undergoes deflection under the application of large loads and is designed to regain its original shape once the load is removed. As such, it serves as a shock absorber that reduces the amount of energy transmitted to the structure connected to the bumper by storing most of the impact energy as potential energy upon deflection during loading. The bumper can be installed individually or in series and thus provides a flexible and modular bumper design for different types of structures.
Referring now to
The load plate 100 includes two mounting sections 104 for mounting the plate portion 102. For example, each mounting section 104 can be bent away from the plate portion 102 to increase the overall strength of the load plate 100. Each mounting section 104 can be mounted to a pair of rods 106 that are connected to a mounting beam 108. When an object collides with the plate portion 102, the plate portion 102 can transfer force to each spring member 12 via its impact surface and cause the spring member 12 to deflect. At the same time, the mounting sections 104 can be configured to slide along the rods 106 such that the load plate 100 moves with the spring members 12 of the bumpers 10. In other cases, the mounting sections 104 of the plate portion 102 are fixed to the frame. In this case, the plate portion 102 can deflect inward towards the spring members 12.
In the illustrated implementation, the frame 202, the support members 14, and the mounting beams 108 can be assembled once to form a permanent structure. The plate portion 102 can be removed and the individual spring members 12 can be replaced. For example, if one of the spring members 12 breaks, the plate portion 102 can be removed and a new spring member 12 can be mounted to the corresponding support member 14 in the previously described manner. After the broken spring member 12 is replaced, the plate portion 102 of the load plate 100 can be reattached to the rods 106 and mounting beams 108 to restore the bumper system 200 to its working condition.
Although the implementations illustrated in
Both in implementations with and without a load plate 100, the spring members 12 can include optic fiber sensors that detect the deflection and load applied to the spring members 12. Such information can be collected and aggregated for maintenance purposes or to ensure that the bumper system 200 has a sufficient number of bumpers 10 to absorb the loads that result when foreign objects collide with the bumper system 200.
Similarly to the boat landing in
In addition to the boat landing and the breasting dolphin shown in
The above description is presented to enable any person skilled in the art to make and use the disclosed subject matter, and is provided in the context of one or more particular implementations. Various modifications to the disclosed implementations will be readily apparent to those skilled in the art, and the general principles defined in this disclosure may be applied to other implementations and applications without departing from scope of the disclosure. Thus, the present disclosure is not intended to be limited to the described or illustrated implementations, but is to be accorded the widest scope consistent with the principles and features disclosed in this disclosure.
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