Abstract: A rear derailleur of a bicycle includes a fixing portion connected to a frame of the bicycle, a linkage assembly, a moving portion, a chain guide assembly, and a driving assembly. The linkage assembly is pivotally connected to the fixing portion. The moving portion is pivotally connected to the linkage assembly. The chain guide assembly is connected to the moving portion. The driving assembly includes a motor and a driving gear assembly connected to the linkage assembly. The motor includes an output shaft for driving the driving gear assembly. The output shaft of the motor drives the linkage assembly to pivot via the driving gear assembly, thereby to drive the moving portion and the chain guide assembly to move. A pivot shaft and a detachable battery module are disposed on the moving portion. The chain guide assembly is pivotally connected to the pivot shaft. The battery module provides an electric power to the motor.

Abstract: A chain driving sprocket for a trolley conveyor. The chain drive sprocket includes a disc shaped central body, chain rings including a first sprocket ring and a second sprocket ring. The first sprocket ring and the second sprocket ring are each removably affixable to the disc shaped central body. The first and second sprocket rings are each provided with spaced apart teeth pairs having a curved surface therebetween, sized and shaped to receive a horizontal shaft in a vertical roller unit of the trolley conveyor, for driving the chain of a trolley conveyor. The disc shaped central body further includes curved rectangular shaped protrusions which extend radially outward on the circumferential surface of the disc shaped body. The chain rings are configured to be interchangeably coupled to each of the two sides of the disc shaped central body, thereby reducing manufacturing cost and reducing maintenance costs, since the chain rings may be replaced when the teeth pairs wear.

Abstract: A bicycle sprocket comprises a sprocket body, a plurality of sprocket teeth, at least one shifting facilitation area, at least one driving facilitation area, and at least one bump portion. The at least one shifting facilitation area is to facilitate at least one of a first shifting operation in which a bicycle chain is shifted from the bicycle sprocket toward a smaller sprocket adjacent to the bicycle sprocket in an axial direction parallel to a rotational center axis of the bicycle sprocket without another sprocket between the bicycle sprocket and the smaller sprocket, and a second shifting operation in which the bicycle chain is shifted from the smaller sprocket toward the bicycle sprocket. The at least one bump portion is provided in the at least one driving facilitation area.

Abstract: Link for a rigid chain, comprising at least one flange, of rectangular overall shape, with a substantially constant thickness perpendicularly to its main plane. The flange comprises a first part and a second part. Each of the parts comprises a heel designed to bear against a corresponding heel of a similar flange of an adjacent link of the rigid chain, and a base designed to form a bearing about a rotary pin with respect to said adjacent link. The heel and the base each extend on either side of the main plane and parallel to said main plane.

Abstract: Examples are provided that describe a cycloid transmission with a chain link ring. An example cycloid transmission includes a motor shaft attached to a disc. The motor shaft may be used for rotating the disc. The cycloid transmission also comprises an outer chain link ring that surrounds the disc. The outer chain link ring includes rollers that are inserted at given interfaces between links of the outer chain link ring. The rollers contact the disc as the disc rotates. The cycloid transmission also comprises a housing. The links of the outer chain link are coupled at the given interfaces. The rollers are inserted at the given interfaces and into the housing.

Abstract: A chain wheel for driving or diverting a conveyor of an apron conveyor including transport plates is disclosed. The transport plates may be releasably connectable via a chain connecting parts to the conveyor chain. The chain wheel may have a chain wheel body including a lateral face. The chain wheel may also have teeth arranged peripherally offset over the lateral face. In addition, the chain wheel may have bearing faces. The bearing faces may be arranged peripherally offset over the lateral face between two adjacently situated teeth. The bearing faces may also be configured to support the chain connecting parts.

Abstract: A back face of each inner link plate of the chain is curved convexly. Heights from a pitch line connecting centers of pin holes of inner and guide link plates to the convex apex portion of the inner link plate and to an apex portion of the guide link plate are equalized. The convex apex portions are brought into contact with a guide face of the chain guide per every pitch and the ear apex portions are brought into contact with the chain guide per every pitch while being shifted by a half pitch from the convex apex portions.

Abstract: A bicycle derailleur adjusting apparatus for adjusting a bicycle derailleur includes a controller. The bicycle derailleur includes a base member adapted to be mounted to a bicycle, a movable member, a linkage coupled between the base member and the movable member, and an actuator configured to move the movable member of the bicycle derailleur among a plurality of derailleur positions. The controller is configured to control the actuator based on a travel value indicative of a travel distance of the movable member between adjacent derailleur positions to update the derailleur positions of the movable member.

Abstract: An object of the present invention is to provide a chain structure which has a simple construction and can prevent a chain from being detached from a gear tooth of a sprocket wheel due to a great wave force and prevent the chain and a flight plate from dropping so as to break members of the chain and the flight plate and the other portions of the chain structure. For accomplishing the object in a chain structure (40) provided with a sprocket wheel (6) in which a plurality of gear teeth capable of engaging with a chain (42) are formed in an outer peripheral portion, and the chain (42) in which a pair of side plate members (18, 20, 44) facing to each other are coupled in an endless manner at plural sets in a length direction.

Abstract: There is provided a wear-resistant chain having a high durability even in severe use environments such as those of a timing chain of an engine even though it is highly efficient and productive. A miniaturizing agent containing silicon is doped in a vanadium cementation process of a base material of steel. Vanadium carbide forming a surface-hardened layer contains a secondary phase composed of an amorphous structure containing silicon within crystal grains and a crystal grain size of the vanadium carbide is miniaturized to 1 ?m or less.

Abstract: Solitary chainring for a bicycle front crank and drive chain, including a plurality of teeth formed thereabout. The plurality of teeth includes a first group of teeth and a second group of teeth alternating with the first group of teeth. Each tooth includes an outer face and an inner face which is opposite the outer face, and each tooth of the first group of teeth includes at least one first protrusion on the outer face or the inner face, and each tooth of the second group of teeth is formed without a first protrusion. The first protrusion is formed by a material deformation on one face of the teeth of the first group of teeth, wherein the material deformation is achieved from the inner face or the outer face, or it is formed by an application of material on one face of the teeth of the first group of teeth.

Abstract: A sprocket comprises a set of standard sprocket teeth, each having a first face width and capable of entry between the inner link plates of a transmission chain and engaging sprocket tooth-engaging driving elements of the chain while restricting side slip of the chain by contact with the inner link plates of the chain. The sprocket also comprises a set of narrow sprocket teeth also capable of engaging driving elements of the chain. Each of the narrow sprocket teeth is narrower than the standard sprocket teeth, and can engage driving elements without contacting the inner link plates of the chain. Contact resistance between the sprocket teeth and the chain is reduced and periodic sounds are reduced, while a stable running path of the chain is maintained.

Abstract: A bicycle sprocket includes a sprocket body and a plurality of sprocket teeth. The sprocket teeth extend radially outwardly from an outer periphery of the sprocket body. The sprocket body includes a first layered member, a second layered member and a third layered member. The first layered member has a first axial surface and a second axial surface. The second layered member is attached to the first axial surface such that the first and second layered members overlap each other in an axial direction as viewed parallel to a rotational axis. The third layered member is attached to the second axial surface such that the first and third layered members overlap each other in the axial direction as viewed parallel to the rotational axis. At least one of the second and third layered members has at least one concavo-convex portion.

Abstract: A reel assembly for a chain hoist having a sprocket mounted to a drive portion of a reel. The sprocket is configured to distribute rotational force to links of a drive chain, such as for moving a spare tire in and out of an access position. The sprocket has a first axial half and a second axial half that are formed via a stamped materials and fixedly secured together centrally and mounted on the drive portion. The sprocket includes protrusions and pairs of fingers arranged around and extending radially from a perimeter thereof in an alternating configuration in a circumferential direction. Each protrusion is constructed and arranged to at least partially extend through and engage at least insides of alternate horizontal links of the chain. The pairs of fingers are configured to be circumferentially aligned and receive radially oriented links of the chain therebetween and contact the outsides thereof.

Abstract: The invention relates to a guide wheel for a rear derailleur in a bicycle gear system for guiding a chain, including an annular wheel body with a central opening for rotatable bearing about a rotational axis of the guide wheel. The guide wheel includes a plurality of radially projecting teeth that are arranged on an outer circumferential surface of the wheel body. A tooth gap is arranged between each adjacent pair of teeth, individual teeth in the area of a root circle of the gear teeth having a predetermined tooth width matched to the chain. For improving the guiding properties, it is provided that the guide wheel has on at least some of the tooth gaps in the area near a tooth gap base and/or on at least some of the teeth at least one guide segment with a greater width than the tooth width of at least one of the adjacent teeth.

Abstract: An inverted tooth chain drive system includes a sprocket supported for rotation about an axis of rotation and including a plurality of teeth defined relative to respective tooth centers. The tooth centers are spaced evenly in a circumferential arrangement about the axis of rotation, and each of the plurality of teeth includes an engaging flank. An inverted tooth chain is engaged with the sprocket and includes a plurality of rows of links each structured for inside flank engagement with the sprocket, with leading inside flanks of each row of links projecting outwardly relative to the trailing outside flanks of a preceding row of links. The leading inside flanks of each row are positioned to make initial meshing contact with the engaging flank of one of the sprocket teeth. At least some of the teeth are standard teeth and other ones of the teeth are flank-relieved teeth.

Abstract: A chain wheel designed to haul in, pay out and/or guide a mooring chain that includes multiple chain sizes. In one configuration, the chain wheel is a dual chain wheel that includes pockets sized to support a larger chain size and pockets sized to support a smaller chain size. The pockets include flat surfaces that support links of the chain as it passes over the chain wheel. The chain wheel also includes whelps designed to support and guide chain segments into proper alignment with the chain wheel.

Abstract: Chain return arrangement and sprocket and chain assembly employed therein with the bow flanks of the horizontal chain links (1) of the chain assembly (10) exhibiting a concave trough at least below an equatorial line (7) and the chain link pockets (52) of the sprocket (50) that receive the horizontal chain links at their tooth flanks (53) in the contact areas (55) to the chain links (1) having a convex crown shape to match the troughed bow flank. This significantly reduces the surface pressures between the two parts.

Abstract: The present invention relates to a sprocket (1) with a circular gear ring (3) comprising a plurality of alternating teeth (4) and tooth spaces (5) with different pitch spacings (T) distributed around the periphery of the gear ring (3), a plurality of successive pitch spacings (T) increasing continuously over a first region of the gear ring (3), and a plurality of successive pitch spacings (T) decreasing continuously in a subsequent region. The invention additionally relates to a chain drive (20), in particular a timing chain drive, comprising a driving chain (14) and at least one sprocket (1) of the type in question.

Abstract: A randomized chain sprocket has a set of four tooth gaps having three different tooth gap radial locations, two different link angles, and a chain with constant link pitch.

Abstract: In a silent chain transmission, the distance between the centers of front and rear pin holes of each of the inner link plates of the chain is smaller than the length of the smallest chord obtained by dividing, by the number of sprocket teeth, the circumference of a circle having a radius extending from the center of the sprocket to the center of a pin hole of a link plate of the chain when the last-mentioned link plate is fully engaged with the sprocket.

Abstract: The present invention pertains to a chain link for an anti-skid chain, wherein the chain link is designed as a straight chain link with an essentially oval shape with an upper and a lower side wall. The outer cross-sectional area of the chain link has a half-round design and the inner cross-sectional area has an angular design. At the same time, the present invention pertains to an anti-skid chain with a chain mesh, which has chain links according to the present invention.

Abstract: A bicycle sprocket is provided with a sprocket body and a chain engagement structure. The chain engagement structure includes sprocket teeth defining chain rollers receiving troughs. At least two consecutive ones of the troughs include a driven-side surface and a non-driven-side surface. The driven-side surfaces each have a first chain roller contact points corresponding to a first radius of a first minimum contact circle when one of the chain rollers is positioned to fittingly contact the driven-side surface. The non-driven-side surfaces each have a second chain roller contact points disposed at a second position corresponding to a second radius of a second minimum contact circle when one of the chain rollers is positioned to fittingly contact the non-driven-side surface. The first radius is larger than the second radius. The driven-side surfaces have effective concavities that are equal to or less than the curvatures of the chain rollers.

Abstract: A deflecting roller for link chains, for example, round link chains or profiled steel chains, presents, on the periphery, chain pockets for lying chain links. Furthermore, chain pockets for standing chain links are provided. The chain pockets for the standing chain links are separated from each other by teeth. The tooth flank surfaces of the teeth, against which a standing chain link bears under the action of a load, are dimensioned and profiled in a specific way. The dimensioning is carried out so that, up to a certain chain loading, the standing chain link does not bear with its nose against the tooth flank. A contact between the tooth flank surface and the nose of the standing chain link concerned occurs only starting at a certain chain loading.

Abstract: A link made from a D-profile steel length, that can be used to form a hoist chain including a substantially planar outer circumferential area and two side flanks opening into the same, each flank comprises a first planar flank section which is substantially perpendicular to the outer circumferential area. The flank section is connected on each side flank with the outer circumferential area via an adjacent planar bevel area which is inclined under a bevel angle obliquely in relation to the same in the direction towards the other side flank.

Abstract: The invention relates to a turnaround curve system for a chain conveyor system, having a chain having linear traction which is driven in turnaround sections by means of turnaround guides (7). The turnaround guides (7) have a geometry obtained by means of a family of curves corresponding to paths defined by six points (1-6), the six points (1-6) corresponding to six linkage positions of consecutive links of the chain in the turnaround sections. The system allows the turnaround sections to be more compact and extend the life of the rollers of the chain, since the rollers are subjected to smaller loads.

Abstract: The invention relates to a chain wheel (2, 3), especially for a timing chain drive, with a rotary shaft, a sprocket wheel (7) positioned around the rotary shaft featuring multiple alternating teeth (17) and tooth gaps (16) distributed around its circumference, as well as at least one chain guide (8), the sprocket wheel (7) and the chain guide (8) are rigidly joined, the chain guide (8) incorporates a contoured surrounding support cage (9) causing it to bear on contact faces of link plates (13, 14) and the support cage (9) or raised regions of the support cage (9) extend along a curved circumference that constitutes the perimeter of the chain guide (8), said perimeter of the chain guide (8) having a non-circular profile.

Abstract: When disposing pins of different shapes at random, pins of small involute base circle radius are made not to be arranged contiguously, pins of relatively small length are made not to be arranged contiguously, and pins of relatively outward offset are made not to be arranged contiguously.

Abstract: A chain sprocket for link chains, for example, round link chains or profiled steel chains, has chain pockets for horizontal chain links. Chain pockets for vertical chain links are also provided. The chain pockets for the vertical chain links are separated from one another by teeth. The tooth flank surface of the tooth that a vertical chain link contacts under the effect of a load is dimensioned and profiled in a special manner. The dimensioning is such that up to a defined chain load the vertical chain link does not contact the tooth flank with its nose. A contact between the tooth flank surface and the nose of the respective chain link occurs only above a defined chain load.

Abstract: In a chain transmission, the guide-contacting portions of inner and outer plates of a chain each comprise a pair of front and rear flat surfaces, an intermediate concave oil-retaining surface and convex connecting surfaces. The lengths of the flat surfaces are such that adjacent flat surfaces of overlapping inner and outer plates overlap even when the plates in contact with the portion of a convex guide surface having the smallest radius of curvature.

Abstract: The invention provides a chain transmission mechanism capable of alleviating impact and impact noise caused when a chain engages and contacts with a sprocket, of not increasing the impact and impact noise even if the chain transmission mechanism is driven in heavy load and in high speed, of reducing vibrations, breakage, wear and others of the chain and the sprocket and of improving its durability. Tooth bottoms of the sprocket are formed so as not contact any pin, bush or drive roller of the connector when the chain is wound around the sprocket as guide rollers rotatably supported coaxially with a pin of the chain rolls on a track along the guide rail provided on the side of teeth of the sprocket. The invention provides a guide rail around the sprocket to engage the chain an lit its impact with the sprocket as the mechanism operates.

Abstract: The end faces of a first pin contain bulging curved faces having an egg-like shape, when viewed along a chain width direction. Each bulging curved face includes a first end portion, a second end portion and a maximum width portion with respect to a chain advancing direction. With respect to perpendicular directions, the distance between the center of the maximum width portion and the first end portion is relatively large, whereas the distance between the center of the maximum width portion and the second end portion is relatively short. It is possible to enlarge the surface area of the bulging curved face.

Abstract: Chain return arrangement and sprocket and chain assembly employed therein with the bow flanks of the horizontal chain links (1) of the chain assembly (10) exhibiting a concave trough at least below an equatorial line (7) and the chain link pockets (52) of the sprocket (50) that receive the horizontal chain links at their tooth flanks (53) in the contact areas (55) to the chain links (1) having a convex crown shape to match the troughed bow flank. This significantly reduces the surface pressures between the two parts.

Abstract: The present invention is directed to decreasing noise from the onset of engagement with the sprocket teeth till seating thereon and also to reducing wear to the silent chain and the sprocket. A face (a) of a sprocket tooth, which contacts the chain at the onset of engagement, has a tooth profile that is an envelope (1) of trajectories described by the inner flank surface (23) of the link plate (2) when the chain moves linearly toward the sprocket (S) and engages with the sprocket (S) without causing a chordal action. A crest (b) of the sprocket tooth, which contacts the chain (S) at the time of seating on the sprocket tooth, has a tooth profile that is an envelope (m) of trajectories described by the crotch (25) of the link plate (2) when the link plate (2) rotates around the connecting pin during the wrapping motion of the chain around the sprocket (S).

Abstract: A continuously-variable transmission includes two transmission members each having coupling elements engageable to couple the transmission members for movement together. At least one of the transmission members is a rotary member rotatable about a rotary axis; and at least one of the groups of coupling elements is radially displaceable towards and away from the rotary axis to change the conversion ratio of the transmission. The coupling elements of one group on one transmission member are of a fixed configuration defining projections alternating with depressions each of a fixed configuration formed on a surface of the transmission member between opposite side faces and having the same pitch for every cross section of the surface perpendicular to the mentioned rotary axis.

Abstract: A bicycle sprocket apparatus comprises a larger diameter sprocket and a smaller diameter sprocket, wherein the larger diameter sprocket has on its outer periphery a plurality of sprocket teeth, the smaller diameter sprocket has on its outer periphery a plurality of sprocket teeth, and a number of sprocket teeth on the smaller diameter sprocket is less than a number of sprocket teeth on the larger diameter sprocket. The larger diameter sprocket includes a tooth and a first chain receiving tooth disposed immediately behind the tooth in the driving rotation direction, wherein the tooth includes a control side surface and an inclined side surface.

Abstract: A sprocket includes a plurality of teeth along the outer circumference of the sprocket, where the teeth include at least a first tooth variant with a first involute length between a root and a tip radii of the sprocket and a first curvature at a given radius of the sprocket and at least a second tooth variant with a second involute length between a root and a tip radii of the sprocket and a second curvature at the given radius of the sprocket. The first curvature is different than the second curvature at a given radius of the sprocket. Such variants are arranged around the circumference in a predetermined way.

Abstract: In a chain and sprocket assembly, the order of the sprocket and the wrap angle of the chain are selected such that the resonance tension of the chain and sprocket assembly is minimized.

Abstract: In a timing chain driving system in which the speed of a driving sprocket fluctuates cyclically, the tooth pitch of a driven sprocket from which a tension span of the chain travels toward the driving sprocket varies cyclically around the circumference of the driven sprocket so that the tooth pitch at the point at which the timing chain disengages from the driven sprocket is at a minimum when the rotational speed of the driving sprocket is maximum, moderating fluctuations in chain tension. A similar effect can be achieved in the case of a driving sprocket having a cyclically varying tooth pitch by arranging the driving sprocket so that its tooth pitch is maximum at the point at which it is engaged by the chain when its rotational speed is maximum.

Abstract: A printer includes an idler movement mechanism that rotates a transfix member at a speed corresponding to a rotational speed for a rotating image member before moving the transfix member into engagement with the rotating image member to form a nip.

Abstract: Projectile ramming apparatus includes a rammer pawl for engaging the base of a projectile with a rigidizable chain attached to the rammer pawl for providing reciprocating movement thereto. The rigidizable chaining includes a plurality of rows of links having adjacent links pivotally attached to one another. A perimeter of each link enables fixed engagement of adjacent links on each row upon coordinated pivoting of adjacent links in each row and, further, for enabling release of the fixed engagement upon reverse coordinated pivoting of adjacent links. A drive is provided for reciprocally moving the chain and for pivoting adjacent links in order to rigidize the chain as the chain is moved in a forward direction; and unlocking, or unrigidizing, adjacent links as the chain is moved in a reverse direction. The chain is moved at a generally constant velocity enabled by the link perimeter.

Abstract: The present invention relates to a sprocket (1) with a circular gear ring (3) comprising a plurality of alternating teeth (4) and tooth spaces (5) with different pitch spacings (T) distributed around the periphery of the gear ring (3), a plurality of successive pitch spacings (T) increasing continuously over a first region of the gear ring (3), and a plurality of successive pitch spacings (T) decreasing continuously in a subsequent region. The invention additionally relates to a chain drive (20), in particular a timing chain drive, comprising a driving chain (14) and at least one sprocket (1) of the type in question.

Abstract: The invention relates to a sprocket for chain drives, with an axis of rotation and with two groups, arranged next to and offset with respect to one another on the circumference of the sprocket, of pockets for chain links passing the sprocket in an oblique position. Each pocket is delimited laterally by a side wall and an opposite wall and, in the circumferential direction, by webs. In order that a sprocket for chain links running in obliquely can be produced more simply and to provide a better distribution of forces, according to the invention the side wall and the opposite wall of a pocket form for the chain links bearing surfaces which run obliquely with respect to the axis of rotation and which extend as far as a bottom of the pockets.

Abstract: In a chain transmission in which a roller chain transmits power from a driving sprocket to one or more driven sprockets, the sprocket teeth are shaped so that at a location radially outward from the sprocket pitch circle, the distance between the front surface of each sprocket tooth to a radial reference line from the sprocket center through the center of the tooth root, is at least as great as the distance from the centerline to the front tooth surface at the pitch circle. The tooth faces merge smoothly with the tooth gap bottom, the sprocket root diameter is smaller than the root diameter according to ISO standards, and the radius of the arcuate tooth gap bottom is greater than the radius of the chain roller.

Abstract: The invention relates to a chain wheel (2, 3), especially for a timing chain drive, with a rotary shaft, a sprocket wheel (7) positioned around the rotary shaft featuring multiple alternating teeth (17) and tooth gaps (16) distributed around its circumference, as well as at least one chain guide (8), the sprocket wheel (7) and the chain guide (8) are rigidly joined, the chain guide (8) incorporates a contoured surrounding support cage (9) causing it to bear on contact faces of link plates (13, 14) and the support cage (9) or raised regions of the support cage (9) extend along a curved circumference that constitutes the perimeter of the chain guide (8), said perimeter of the chain guide (8) having a non-circular profile.

Abstract: A transmission that is rotatable and connectable to the gravity mass increases the speed of rotation.

Abstract: A transmission chain for a transmission having a drive sprocket and a driven sprocket with chain guides between the sprockets, at least one of the guides having a curved surface on which one of the runs of the chain slides in its travel between the sprockets. The chain has inner and outer link plates which respectively mount bushings and connecting pins which pass through the bushings with a clearance. The link plates have sliding surfaces which slide on the guide. The transmission chain has a chain pitch defined as P1, and the maximum clearance formed between the connecting pins and the bushings is defined as C. The sliding surfaces are curved like the guide and the curved surfaces of one of the outer and inner link plates, has a curve width X, and the curved surface of the other of the inner and outer link plates, has a curve width Y.

Abstract: Embodiments of the present invention include bicycle chain rings for bicycles having specially shaped ramps, tapers and profiled teeth for improved shifting performance. Additional embodiments of the bicycle chain rings of the present invention may be configured with one or more additional features formed within the chain rings including a transition slide, a tapered ramp face, a ramp bridge, a ramp lead, a trailing transition slide and a wear pin.

Abstract: A sprocket assembly mounted to a hub has at least eleven sprockets. The hub is able to rotate about a rotation axis and has a plurality of spoke attachment seats and a fastening portion to a frame of the bicycle. On the hub a predetermined axial distance is defined between a plane, substantially perpendicular to the rotation axis, comprising the points of the spoke attachment seats closest to the freewheel body and a plane, substantially perpendicular to the rotation axis and defined in the fastening portion to the frame, comprising the attachment points to the frame closest to the freewheel body. All of the sprockets of the sprocket assembly, when associated with the freewheel body, have an overall axial width that is lower than or equal to the predetermined axial distance. The chain has a maximum thickness between 4.6 mm and 5.8 mm.

Abstract: A device is described for transport of chain lengths of varying link sizes, where the device comprises at least a first side plate for fastening on a shaft, and at least four catching arms arranged on the first side plate in a radial pattern, where each catching arm is arranged at an angle of about 90 degrees in relation to the next catching arm.