Patent Description:
The present invention may concern the industry manufacturing ventilation arrangements designed for capturing gases or may concern the industry using such damper adjusting arrangements.

The present invention may concern a damper adjusting arrangement that is configured to be mounted to a wide range of extraction apparatuses configured to capture e.g. welding fumes and dust at the source or work site. The captured gas may be smoke, welding fume, dusts, vapours or other gaseous fluid.

The present invention especially may concern the fume extractor manufacturing industry producing damper adjusting arrangements configured for high suction and high flow extraction performances.

The present invention especially may concern the industry making use of such damper adjusting arrangements.

In particular, the invention relates to a damper adjusting arrangement, wherein the dampening of the flow of gaseous fluid through the extractor tubing is possible to adjust in a rigid way and in a controlled manner.

In industrial environments an appropriate air exchange and/or ventilation is of utmost importance for environmental and processing reasons. Processes generating fumes or gases, which may cause health issues or interfere with the process at hand, must be handled with proper care to ensure that fumes or gases are disposed of in an efficient manner.

For some processes, the need to adjust the flow of gaseous fluids, guided by the channel of the extractor tubing of the ventilation arrangements, may be present. If only a small amount of gaseous fluid needs to be collected by the arrangement, it may be ineffective to extract the gaseous fluid at full effect.

One way to achieve less than full extraction of gaseous fluid is made by means of adjustable dampers provided to the channel of the extractor tubing, which dampers are operable and adjustable from outside.

Current adjustable dampers often use a disc shaped element or other suitable damper element arranged in the channel of the extractor tubing.

The disc shaped element is preferably coupled to a rotary shaft reachable exterior the extractor tubing directly or indirectly via a handle. The operator rotates the handle for adjusting the angle of the disc shaped element relative the centre line of the channel of the extractor tubing.

The shaft preferably extends through the wall of the extractor tubing on opposite sides to ensure a secure mounting of the shaft to the extractor tubing.

Repeated use of current adjustable dampers may impair the frictional forces of friction joints configured to keep the disc shaped element in adjusted position relative the centre line of the extractor tubing.

Over time, this may lead to even more wear resulting in impaired dampening effect.

High effect extractor tubing arrangements using adjustable dampers and adjustable dampers having large diameter may be subjected to high forces in harsh environment.

Adjustable dampers may be subjected to heat, oil, high under pressure, dirt, etc..

There is thus a need for an improved adjustable damper arrangement, which overcomes the drawbacks of prior art and provides a reliable and accurate dampening effect at the same time as the adjustable damper arrangement can be made with manufacturing cost.

Chinese design registration ZL <NUM> (to Fumex AB) discloses an adjustable damper arrangement comprising a disc shaped element pivotable arranged in a channel of an extractor tubing and coupled to a handle arranged exterior the extractor tubing.

The handle is provided with a plurality of bulges protruding in axially direction and arranged in a plane extending transversal to the axis of the channel in accordance with a certain pattern. The pattern engages a corresponding pattern of a base portion for forming a friction joint configured to keep the disc shaped element in the adjusted position relative the centre line of the extractor tubing.

The adjustable damper arrangement disclosed in<CIT> works well, and is subject to development. <CIT> discloses a damper according to the preamble of claim <NUM>.

An object is to provide a damper adjusting arrangement, which comprises a rotary control means configured to regulate the flow of gaseous fluid in the channel of the extractor tubing in a reliable way.

An object is to provide a damper adjusting arrangement, which is robust, user friendly, cost-effective to manufacture and which may exhibit long-life and long-term mechanical performance.

A further object is to provide a damper adjusting arrangement, which is able to regulate the dampening effect in discrete steps.

An object is to provide a damper adjusting arrangement comprising a damper member, which may be rotated between a fully open state and a fully closed state in said channel of the extractor tubing.

There is an object to provide a robust damper adjusting arrangement configured for regulating of high rate flow of gaseous fluid in the extractor tubing.

There is an object to provide a damper adjusting arrangement involving safety and comfort in regulating high rate flow of gaseous fluid in the extractor tubing.

An object of the present invention is to provide a damper adjusting arrangement, which overcomes drawbacks of prior art.

This or at least one of said objects has been solved by a damper according to claim <NUM>.

Alternatively, the resilient element comprising a plurality of radially and inwardly protruding first bulges.

Alternatively, the first member comprises a plurality of radially and inwardly protruding first bulges.

Alternatively, the second member comprises a plurality of radially and outwardly protruding second bulges.

Alternatively, the plurality of radially and inwardly protruding first bulges being configured for engagement with the plurality of radially and outwardly protruding second bulges.

Alternatively, the first member comprises a first leg connected to or integrally joined to a first and a second end portion of the first member.

Alternatively, the first member comprises a second leg connected to or integrally joined to the first and the second end portion of the first member.

Alternatively, the first end portion comprises a first through hole and/or the second end portion comprises a second through hole.

Alternatively, the resilient element comprises said first and second leg.

Alternatively, the first member is formed as an elongated washer-like planar tongue comprising a central open area, configured to encompass the second member, and having the first and the second leg connected to the first and to the second end portion, wherein the first and second leg each comprises a plurality of inwardly facing bulges forming a wave-shaped pattern.

Alternatively, an imaginary central axis extends through the central open area and extends perpendicular to the plane of the elongated washer-like planar tongue.

Alternatively, the first member comprises a plurality of radially first bulges, protruding inwardly towards an imaginary central axis, about which the damper member is pivotable.

Alternatively, the first leg comprises a first flexible portion and a second flexible portion, wherein a first plurality of said first bulges are positioned between the first flexible portion and the second flexible portion and being configured to engage the second member.

Alternatively, the second leg comprises a third flexible portion and a fourth flexible portion, wherein a second plurality of said first bulges are positioned between the third flexible portion and the fourth flexible portion and being configured to engage the second member.

Alternatively, the first and/or second and/or third and/or fourth flexible portion exhibiting various thickness and/or width.

Alternatively, the first and/or second and/or third and/or fourth flexible portion exhibiting a first width and a second width, wherein the first width is wider than the second width, for providing a flexibility and/or a resilience of the resilient element.

Alternatively, the first member comprises steel (e.g. high-strength steel or hardened steel or other suitable composition of steel).

In such a way is achieved that, upon rotation of the second member, as the second bulges are positioned at the circumference and outermost edge of the second member, a distinct frictional force holding the first bulge (in a second recess formed between two adjacent second bulges) is defined by the perpendicular distance between the axis centre and the line of action of the force acting on the second bulge.

In such way is achieved a robust and long-life damper adjusting arrangement.

Alternatively, the first member is entirely made of resilient material.

The first member is formed as an elongated washer-like planar tongue with an open area and having a first and second leg connected to a first and a second end portion, wherein the first and second leg each comprises a plurality of inwardly facing bulges forming a wave-shaped pattern.

In such way, the first member can be manufactured as a sheet metal pressed component, wherein the damper adjusting arrangement can be produced cost-effective.

The second member is positioned between and in contact with the first and second leg.

Alternatively, each first and second leg may be formed as a rod or strip and may be integrated parts of the first member.

Alternatively, the first member may be of generally elongated configuration or any other appropriate configuration.

The respective first and second leg being configured to be spring-biased against the second member.

Due to the sliding contact between the first and second bulge, enhanced friction can be achieved by the spring-biased engagement in a robust way.

Alternatively, the second member is configured as a wheel, a ring- or disc-shaped body or other circular body configured to be able to be rotated together with the axis, when the first and second leg spring in a direction away from the second member and the plurality of first bulges ride over the engaged second bulges of the second member.

Alternatively, the first bulges being formed along at least one imaginary arc.

Alternatively, the imaginary arc is defined by an imaginary circle, the centre of which corresponds with a rotary axis of the second member.

Alternatively, the first member of the rotary control means comprises a resilient washer or washer-like resilient member having a plurality of inwardly and in radial direction protruding bulges.

Alternatively, the resilient washer or washer-like resilient member comprises high-strength steel or high-strength low-alloy steel or stainless steel.

Alternatively, the plurality of inwardly and in radial direction protruding first bulges being formed along at least one imaginary circular arc defined by the radius between the perimeter and the rotary axis the second member.

Alternatively, the plurality of inwardly and in radial direction protruding first bulges being formed along two opposite arranged imaginary circular arcs of the first member. Alternatively, the imaginary circular arc is formed by a well-defined sector of an imaginary circle, the centre of which corresponds with a rotary axis of the second member. Alternatively, the plurality of outwardly and radially protruding second bulges is formed around an outer periphery of the second member, wherein the plurality of bulges forms a wave-shaped pattern.

Alternatively, the second member comprises a non-resilient engagement portion configured to be engaged with the first member and configured to be rotatable arranged and coupled to the damper member for providing a rotary motion thereof.

Alternatively, the resilient element of the first member exhibits a higher degree of resilience than that of the second member.

Alternatively, the second member comprises a plurality of outwardly and in radial direction protruding bulges, the geometry of which corresponds with the geometry of the inwardly protruding bulges of the first member.

Alternatively, a handle member is coupled to the damper member via the second member, which handle member is rotary arranged exterior the extractor tubing for providing a rotary motion of the second member.

Alternatively, the handle member is coupled to the damper member via a shaft comprising the second member.

Alternatively, the engagement portion of second member is configured to be engaged with the first member and is configured to be rotatable arranged and coupled to the damper member for providing a rotary motion thereof, when the handle member is rotated.

Alternatively, the second member comprises a wheel-formed or rim-shaped member comprising the plurality of outwardly and in radial direction protruding bulges, which bulges are arranged along the circumferential direction thereof.

Alternatively, the first member of the rotary control means is configured to be rotatable arranged and coupled to the damper member for providing a rotary motion thereof.

Alternatively, the first member of the rotary control means comprises a resilient rim-like member having a plurality of outwardly and in radial direction protruding bulges.

Alternatively, the second member comprises a non-resilient engagement means configured to engage the plurality of outwardly and in radial direction protruding bulges of the resilient rim-like member of the first member.

Alternatively, the damper adjusting arrangement is configured to be mounted to an extractor tubing having significant diameter.

Alternatively, the respective first bulge may be considered as pawl-like element spring-biased into engagement with a second recess.

The respective bulge may be defined as a bulge, a swelling, a bump, a protrusion, a tooth, a projection, etc..

The respective recess may be defined as a depression, a cavity, a depth, an indentation, a slot, etc..

The respective first bulge may be arranged adjacent each other about an inner broken circumference of the resilient element.

The respective second bulge may be arranged adjacent each other about an outer circumference of the non-resilient element.

The respective first bulge may be configured to spring away from and ride over an engaging corresponding second bulge, for subsequently drop down into a second recess of the second member, wherein the resilient element is in a springs back position and holds the second member in position.

The rotary control means may comprise the axis, the first and second member and a handle member coupled to the axis,.

The present invention will now be described by way of examples with references to the accompanying schematic drawings, of which:.

Hereinafter, exemplary embodiments of the present invention are described with reference to the accompanying figures, wherein for the sake of clarity and understanding of the invention some details of no importance may be deleted from the drawings.

<FIG> illustrates an extractor tubing <NUM> comprising a damper adjusting arrangement <NUM> according to a first example. The extractor tubing <NUM> is designed for source capturing different gases dust avoiding their expansion in a worksite. A suction fan <NUM> is coupled to a channel <NUM> of the extractor tubing <NUM> at a first end. A hood <NUM> is mounted to the extractor tubing <NUM> at a second end. An adjustable tubing joint <NUM> comprises a pivot mechanism <NUM> providing that the hood <NUM> can be pivoted in three-dimension. The damper adjusting arrangement <NUM> comprises a disc shaped element <NUM> mounted in the channel <NUM> and configured to be adjustable in fully open state or in a fully closed state or rotated into a holding position there between.

The damper adjusting arrangement <NUM> is held in the adjusted position by means of frictional forces of a friction joint between a first and second member (not shown) to keep the disc shaped element <NUM> in adjusted and held position relative the centre line CL of the channel <NUM>.

An operator (not shown) can easily turn a knob <NUM> coupled to the disc shaped element <NUM> via the friction joint for adjusting the disc shaped element <NUM> and regulating the flow of gaseous fluid.

It is extremely important that the friction joint being rigidly configured, as high rate gaseous fluid flow in the channel <NUM>, which also may have a large diameter, requires robust damper adjusting arrangements.

The features of the friction join between the first and second member will be further described by examples below.

<FIG> illustrates an extractor tubing <NUM> comprising a damper adjusting arrangement <NUM> according to a second example. The damper adjusting arrangement <NUM> comprises a disc shaped element <NUM> rotatable arranged in a channel <NUM> of the extractor tubing <NUM>.

The damper adjusting arrangement <NUM> is configured for regulating the flow of a gaseous fluid within the channel <NUM>. The disc shaped element <NUM> is arranged pivotable arranged together with an axis <NUM> extending transversely to a centre line CL of the channel <NUM>.

A knob <NUM> is positioned exterior the extractor tubing <NUM> and coupled to the axis <NUM> for rotating the disc shaped element <NUM>. The axis <NUM> is supported at each end by a respective bearing <NUM> arranged in the wall of the extractor tubing <NUM>.

A rotary control mechanism <NUM> of the damper adjusting arrangement <NUM> is arranged to the extractor tubing <NUM> wall.

A first member (not shown) of the rotary control mechanism <NUM> comprising a resilient element (not shown), which exhibits a plurality of inward and radially protruding first bulges being configured for engagement with a second member (not shown) of the rotary control means.

The inward and in radial direction protruding bulges are configured to engage a plurality of outwardly and in radial direction protruding second bulges of a non-resilient second member.

The second member is configured to be rotatable arranged and coupled to the damper member for providing a rotary motion of the damper member (the disc shaped element <NUM>).

The geometry of the first bulges may correspond with the geometry of the second bulges.

An operator (not shown) will rotate the knob <NUM> under influence of the rotary control mechanism <NUM>, wherein the first bulges of the resilient element are configured to spring away from the second bulges, when rotating the second member, generating a frictional force between the first and second member.

A first recess is positioned between two first bulges.

A second recess is positioned between two second bulges.

When a second bulge or second bulges being positioned in the first recess or in the respective first recess, the resilient element is in a springs back position and holds the second member in position. In such a way, the operator can adjust the damper member to a desired held position (held in position by the resilient member).

For example, if he wants to set a full flow of gaseous fluid through the channel <NUM>, he simply turns the knob <NUM> to a "fully open" mark (not shown).

For example, if he wants to set the flow of gaseous fluid through the extractor tubing <NUM> to an "idle position" -state or full closed position, he simply turns the knob <NUM> to a "closed" mark (not shown).

The first bulge is spring-biased into engagement with a second recess.

<FIG> illustrates a damper adjusting arrangement <NUM> according to a third example in an exploded view. The damper adjusting arrangement <NUM> is configured for regulating the flow of a gaseous fluid within a channel <NUM> of an extractor tubing <NUM>. The damper adjusting arrangement <NUM> comprises a disc-shaped damper <NUM> rigidly coupled to a shaft (axis) <NUM> having square cross-section. The shaft <NUM> is in turn rigidly coupled to a handle <NUM>. An operator (not shown) turns the handle <NUM> for rotating the disc-shaped damper <NUM>. A bracket arm <NUM> configured to hold a pivot mechanism is attached to the extractor tubing <NUM>.

A first member <NUM> may be attached to the extractor tubing <NUM> (e.g. via the bracket arm <NUM>).

The first member <NUM> of the damper adjusting arrangement <NUM> comprises a resilient washer <NUM>, which exhibits a plurality of inwardly protruding first bulges (not shown) being configured for engagement with a second member <NUM> being rigidly coupled to the shaft <NUM>. The second member <NUM> comprises a plurality of outwardly protruding second bulges (not shown) configured for engagement with said first bulges.

A respective recess is positioned between two adjacent bulges and when a respective second bulge is moved into a recess between adjacent first bulges, a portion of the resilient washer carrying the first bulges will springs back and hold the second member <NUM> in position. In such a way, the operator can rotate the disc-shaped damper <NUM> into a desired held position (thus held in position by the spring back effect of the resilient member).

<FIG> illustrates a damper adjusting arrangement <NUM> according to a fourth example. The damper adjusting arrangement <NUM> is configured for regulating the flow of a gaseous fluid AF within a channel <NUM> of an extractor tubing <NUM>.

The damper adjusting arrangement <NUM> comprises a disc-shaped damper <NUM> rigidly coupled to a shaft <NUM> having square cross-section. The shaft <NUM> is rotatable arranged about an axis extending transverse the centre line of the channel <NUM> and is rigidly coupled to a knob <NUM> or wing nut. An operator (not shown) turns the knob <NUM> for rotating the disc-shaped damper <NUM> for regulating the flow of a gaseous fluid AF.

A first member <NUM> may be attached to the extractor tubing <NUM> by means of rivets <NUM>. The first member <NUM> of the damper adjusting arrangement <NUM> comprises a resilient washer <NUM>, which exhibits a plurality of inwardly protruding first bulges <NUM> being configured for engagement with second bulges <NUM> of a second member <NUM> (e.g. non-resilient engagement wheel or other circular body) rigidly coupled to the shaft <NUM>.

The plurality of outwardly protruding second bulges <NUM> being configured for engagement with said first bulges <NUM>.

The first and second bulges <NUM>, <NUM> comprise a common width, wherein at least the first bulge <NUM> and the second bulge <NUM> being arranged to interact with each other to provide a discrete stepped control of the rotation of the second member <NUM>, wherein one discrete step corresponds to the width of the respective first <NUM> and second <NUM> bulge.

The second member coupled to the disc shaped element <NUM> and to the knob <NUM> can thus be rotated in discrete steps, which makes the damper adjusting arrangement <NUM> easy to use in a controlled way.

<FIG> illustrate a first <NUM> and second <NUM> member of a damper adjusting arrangement according to a fifth example. The first member <NUM> comprises a washer-like flat element having a central portion occupied by the second member <NUM>.

The washer-like flat element may be made of high-strength steel and may comprise a first <NUM> and a second <NUM> resilient portion, having inwardly protruding first bulges <NUM>, positioned at opposite sides and on both sides of the second member <NUM>.

The second member <NUM> is configured as a wheel-like rotary part having the second bulges <NUM> that protrude outward and are configured to engage the first bulges <NUM> of the first member <NUM>. A rotary axis <NUM> is coupled to the second member <NUM>.

The first <NUM> and second <NUM> member and a handle or knob (not shown), and the rotary axis may constitute a rotary control means <NUM> (damper adjustment mechanism).

The pattern and design of the first <NUM> and second <NUM> bulges may be of any suitable shape for reaching a robust and reliable rotary control means <NUM>. The respective bulge may be defined as a swelling, a bump, a protrusion, a tooth, a projection, etc..

However, for example, a smooth wave-like shape may be used for forming the bulges and recesses.

A first recess <NUM> is positioned between two first bulges <NUM>. A second recess <NUM> is positioned between two second bulges <NUM>. The respective recess may be defined as a depression, a cavity, a depth, an indentation, a slot, etc..

The respective first bulge <NUM> of the respective first <NUM> and the second <NUM> resilient portion may be configured to spring away from the second member <NUM> (as shown in <FIG>) when riding over a corresponding second bulge <NUM> (during rotation of the second member <NUM>), for subsequently drop down into the second recess <NUM> of the second member <NUM>, wherein the respective first <NUM> and the second <NUM> resilient portion springs back for holding the second member <NUM> in position. The disc shaped element (not shown) coupled to the second member <NUM> will thus be held in position for regulating the flow of gaseous fluid in the channel (not shown).

The first bulges <NUM> being formed along at least one imaginary arc L1, which may follow an imaginary circle, the centre of which corresponds with the axis of the second member <NUM>.

Reference <NUM> in <FIG> marks a pair of guide arms configured to guide the first member <NUM> in proper position relative the second member <NUM>.

<FIG> illustrates a damper adjusting arrangement <NUM> comprising a rotary control means <NUM> according to a sixth example. The damper adjusting arrangement <NUM> is configured for regulating the flow of a gaseous fluid within a channel <NUM> of an extractor tubing <NUM>. The damper adjusting arrangement <NUM> comprises a disc-shaped damper <NUM> rigidly coupled to a shaft <NUM> and to a handle (not shown).

A first <NUM> and second <NUM> member and the handle and shaft <NUM> may constitute the rotary control means <NUM>.

The disc-shaped damper <NUM> is configured to be rotated by means of the shaft <NUM> in incremental steps between a fully open state FOS and a fully closed state FCS in said channel <NUM> of the extractor tubing <NUM>.

<FIG> illustrate different types of inwardly facing bulges of a first member <NUM> forming a wave-shaped pattern protruding inwardly toward a second member (not shown).

<FIG> illustrates an extractor tubing comprising a damper adjusting arrangement <NUM> according to a seventh example. The damper adjusting arrangement <NUM> is configured for regulating the flow of a gaseous fluid within a channel <NUM> of an extractor tubing (not shown). The damper adjusting arrangement <NUM> comprises a damper member <NUM>, which is pivotable arranged in the channel <NUM> and coupled to a rotary control means <NUM> mounted to the damper adjusting arrangement <NUM>. A first member <NUM> of the rotary control means <NUM> comprises a resilient element <NUM>, which exhibits a plurality of radially outwardly protruding first bulges <NUM> being configured for engagement with a second member <NUM> of the rotary control means <NUM>.

<FIG> illustrates an exemplary first member <NUM> of a damper adjusting arrangement according to an eight example.

The first member <NUM> may be formed as an elongated washer-like planar tongue with a centrally positioned open area A. The first member <NUM> may have a first <NUM> and second <NUM> leg connected to a first <NUM> and a second <NUM> end portion of the first member <NUM>. The first and second leg <NUM>, <NUM> each comprises a plurality of inwardly facing first bulges <NUM> forming a wave-shaped pattern. The first member can be manufactured as a sheet metal pressed component.

Alternatively, an imaginary central axis X extends through the central open area A and extends perpendicular to the plane of the elongated washer-like planar tongue.

Alternatively, the first member <NUM> comprises the first leg <NUM> connected to or integrally joined to the first <NUM> and to the second <NUM> end portion of the first member <NUM>.

Alternatively, the first member <NUM> comprises the second leg <NUM> connected to or integrally joined to the first <NUM> and the second <NUM> end portion of the first member.

Alternatively, the first end portion <NUM> comprises a first through hole <NUM>' and the second end portion <NUM> comprises a second through hole <NUM>'.

The central open area A is configured to encompass the second member (shown in <FIG>).

Alternatively, the first leg <NUM> comprises a first flexible portion <NUM> and a second <NUM> flexible portion, wherein a first plurality <NUM>' of said first bulges of a first intermediate portion <NUM> of the first leg <NUM>, is positioned between the first flexible portion <NUM> and the second <NUM> flexible portion and being configured to engage the second member.

Alternatively, the second leg <NUM> comprises a third flexible portion <NUM> and a fourth <NUM> flexible portion, wherein a second plurality <NUM>" of said first bulges a second intermediate portion <NUM> of the second leg <NUM>, are positioned between the third flexible portion <NUM> and the fourth flexible portion <NUM> and being configured to engage the second member.

The first, second, third and fourth flexible portion <NUM>, <NUM>, <NUM>, <NUM> exhibiting various thickness and/or width, wherein a first width w1 is wider than a second width w2, for providing a flexibility and/or a resilience of the resilient element.

<FIG> illustrates an exemplary second member <NUM> of a damper adjusting arrangement according to a ninth example. A square shaped through-hole is provided for a shaft <NUM> coupled to a disc-shaped plate rotatable in a channel (not shown) of an extractor tubing and coupled to a handle or knob.

The perimeter of an outwardly facing edge area <NUM> of the second member <NUM> is oriented coaxial with the shaft <NUM> and is provided with outwardly and radially protruding second bulges <NUM>.

Claim 1:
A damper adjusting arrangement (<NUM>) configured for regulating the flow of a gaseous fluid within a channel (<NUM>) of an extractor tubing (<NUM>), the damper adjusting arrangement (<NUM>) comprises a damper member (<NUM>) pivotable arranged in the channel (<NUM>) and coupled to a rotary control means (<NUM>) of the damper adjusting arrangement (<NUM>), wherein a first member (<NUM>) of the rotary control means (<NUM>) comprising a resilient element (<NUM>, <NUM>), which exhibits a plurality of radially protruding first bulges (<NUM>) being configured for engagement with a second member (<NUM>) of the rotary control means (<NUM>), characterized in that the first member (<NUM>) is formed as an elongated washer-like planar tongue with an open area (A) and having a first (<NUM>) and second leg (<NUM>) connected to a first (<NUM>) and a second end portion (<NUM>), wherein the first (<NUM>) and second leg (<NUM>) each comprises a plurality of inwardly facing first bulges (<NUM>, <NUM>') forming a wave-shaped pattern, wherein the second member (<NUM>) is positioned between and in contact with the first (<NUM>) and second leg (<NUM>), wherein the respective first (<NUM>) and second leg (<NUM>) is configured to be spring-biased against the second member (<NUM>).