Waist buckle assembly

Abstract

The utility model discloses a waist buckle assembly, which comprises a waist buckle, a waist buckle, an elastic piece and a connecting piece, wherein the body of the waist buckle is provided with an opening for a waistband to penetrate through so as to be fixed; the waist buckle assembly comprises a waist buckle body and a shell, the shell is connected to the waist buckle body in the mode that the waist buckle body can rotate around a rotation axis, the shell is provided with a pipe connector and located on the far side of the waist buckle, and the waist buckle assembly is characterized by further comprising a limiting feature arranged between the shell and the waist buckle, and a plurality of rotating gears of the shell relative to the waist buckle are limited.

Description

Technical Field

[0001] This application generally relates to a waist buckle assembly, particularly a waist buckle assembly for use in conjunction with electric air-purifying respirators, compressed air pipeline breathing devices, respiratory protection devices, and cooling and heating valve products. Background Art

[0002] If a user needs to work in a place with poor air quality (e.g., a place with excessive dust, a place where bacteria or viruses need to be protected, etc.), usually he / she will be equipped with an electric air-purifying respirator. For example, such an electric air-purifying respirator includes a main body and a breathing mask, and the main body is in fluid communication with the breathing mask via a hose. The main body is usually configured to inhale ambient air, filter it, and then transmit it to the breathing mask via the hose. The breathing mask is worn by the user on the face, and thus the user can inhale the purified air to ensure good health. In addition, in hot and cold workplaces, cooling and heating valve equipment is needed. The valve equipment is fixed to the human waist via a waistband through a waist buckle, and the air inlet joint of the valve needs to be connected to a compressed air pipeline.

[0003] To facilitate work, it is necessary to fix the hose relative to the user's body to prevent the hose from swinging around the user's body unnecessarily. Conventionally, a waist buckle is used to fix the hose relative to the user's body. For example, such a waist buckle can pass through the waistband and be fixed accordingly. However, the conventional waist buckle does not allow the hose to rotate relative to the waistband or be locked in a certain rotational position. This will cause the hose to deform abnormally during use and thus affect the smooth transmission of the purified air, resulting in difficulty in breathing for the user. In addition, in the waist buckle of the prior art, although there is a joint on the waist buckle to connect the hose, it is difficult to lock the joint in a certain specific rotational position, causing the hose to become entangled and deform abnormally, and affecting the smooth transmission of the purified air. Summary of the Utility Model

[0004] Mainly aiming at the above problems, this application aims to propose a novel waist buckle assembly, so that the joint of the hose for connecting the breathing mask attached via the waist buckle assembly can be rotated and locked in position appropriately as needed, so as to improve the smooth reliability of air transmission.

[0005] According to one aspect of the present application, there is provided a waist buckle assembly, which includes:

[0006] A waist buckle, an opening is provided on the body of the waist buckle for the waistband to pass through for fixation;

[0007] A housing, the housing is connected to the body of the waist buckle in such a way that the body of the waist buckle can rotate around a rotation axis, the housing is provided with a pipe joint and is located on the far side of the waist buckle, and the waist buckle assembly further includes:

[0008] A limiting feature is provided between the housing and the waist buckle to define a plurality of rotation positions of the housing relative to the waist buckle.

[0009] Optionally, the limiting feature includes a stop piece provided on one of the housing and the body of the waist buckle, and a plurality of valleys provided on the other of the housing and the body of the waist buckle and spaced apart around the rotation axis. At least a part of the stop piece can be selectively engaged in one of the plurality of valleys to stop the housing from rotating relative to the waist buckle in the position corresponding to the valley.

[0010] Optionally, the waist buckle assembly further includes a fixing button having a head and a fixing portion axially extending from the head. The fixing portion of the fixing button is inserted into the housing from the proximal surface of the body of the waist buckle to axially clamp the body of the waist buckle between the housing and the head.

[0011] Optionally, the housing includes a receiving seat axially extending in the proximal direction and a stop piece receiving sleeve axially extending in the hollow interior of the receiving seat. The receiving seat and the stop piece receiving sleeve are coaxial.

[0012] A boss integrally extends from the distal surface of the body of the waist buckle, a positioning sleeve axially extends from the boss in the distal direction, and a through hole is formed at the center of the body of the waist buckle.

[0013] The stop piece receiving sleeve is configured to be axially divided into a first section and a second section. The first section is located proximal to the second section. The first section is rotatably inserted into the through hole, the positioning sleeve is rotatably inserted into the receiving seat, a receiving hole is formed in the positioning sleeve, and the fixing portion is inserted into the receiving hole and fixed therein.

[0014] And the receiving seat, the first section, the through hole, and the receiving hole of the positioning sleeve are coaxially provided relative to the rotation axis.

[0015] Optionally, a receiving space is defined between the second section of the stop piece receiving sleeve and the inner peripheral surface of the positioning sleeve, and the limiting feature is located in the receiving space.

[0016] Optionally, the stop piece is formed by bending a metal sheet and has a contact end in the middle and positioning ends at opposite ends. Two oppositely opened stepped portions are formed on the second section of the stop piece receiving sleeve to respectively receive the opposite positioning ends, and the plurality of valleys are evenly spaced on the inner peripheral wall of the positioning sleeve. At each rotation position, the contact end of the stop piece is engaged in one of the plurality of valleys.

[0017] Optionally, the retaining piece is held radially compressed within the receiving space between the second section of the retaining piece receiving sleeve and the inner peripheral wall of the positioning sleeve.

[0018] Optionally, the opposite positioning ends of the retaining piece are received by the stepped portion and are held on the stepped portion regardless of whether the housing rotates relative to the body of the waist buckle.

[0019] Optionally, the axis of rotation is along the normal direction of the body of the waist buckle or parallel to the normal direction; and / or, when viewed in a plane perpendicular to the axis of rotation, the line connecting the two stepped portions does not pass through the axis of rotation.

[0020] Optionally, the proximal surface of the body of the waist buckle is curved.

[0021] By adopting the above technical means of the present application, the housing configured with the joint can rotate relative to the waist buckle reliably and be temporarily fixed by locking the position as needed. At the same time, it can also be easily unlocked from the locked position and temporarily fixed again, thereby avoiding the entanglement of the hose connected to the joint and affecting the smooth transmission of air. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The principles and various aspects of the present application can be more comprehensively understood from the following detailed description in conjunction with the accompanying drawings below. It should be noted that the scales of the various drawings may be different for the purpose of clear illustration, but this will not affect the understanding of the present application. In the drawings:

[0023] Figure 1 Schematically shows a schematic diagram of a non-limiting example of the waist buckle assembly involved in the present application used in an electric air purification respirator;

[0024] Figure 2 Schematically shows a front view of the waist buckle assembly according to an embodiment of the present application;

[0025] Figure 3 Schematically shows Figure 2 a side view of the waist buckle assembly;

[0026] Figure 4 Schematically shows according to Figure 2 a partial cross-sectional view of the waist buckle assembly, where the waist buckle is not shown; and

[0027] Figure 5 Schematically shows Figure 3 a corresponding partial cross-sectional side view of the waist buckle assembly. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] In the drawings of the present application, features with the same structure or similar functions are denoted by the same reference numerals.

[0029] The waist buckle assembly discussed in the present application can be used in conjunction with devices that need to fix a hose relative to the user's body, such as an electric air-purifying respirator. Figure 1 A non-limiting example of such a device is shown only by way of an electric air-purifying respirator. Those skilled in the art should be clear that any device that needs to fix a hose relative to the user's body can adopt the waist buckle assembly described or required to be included in the present application.

[0030] As Figure 1 described, the electric air-purifying respirator generally includes a main body 200 and a breathing mask 300. The main body 200 is configured to be able to inhale air from the environment and purify the air. The breathing mask 300 can be worn by the user on the face. A hose is disposed between the main body 200 and the breathing mask 300 to achieve fluid communication therebetween. The hose can include, for example, a first hose section 210A and a second hose section 210B. Two ends of the first hose section 210A are respectively in fluid communication with the gas inlet of the breathing mask 300 and the gas outlet of the waist buckle assembly 100, and two ends of the second hose section 210A are respectively in fluid communication with the exhaust outlet of the main body 200 and the gas outlet of the waist buckle assembly 100. The waist buckle assembly 100 can be fixed relative to the user's body via a waist belt 400. For example, the main body 200 can also be fixed relative to the user's body via an additional back strap.

[0031] Figure 2 A formal diagram of the waist buckle assembly 100 according to an embodiment of the present application is schematically shown. For example, the waist buckle assembly 100 includes a waist buckle 110. The waist buckle 110 has a main body, and elongated openings, namely a first opening 111 and a second opening 112, are respectively formed on the left and right sides of the waist buckle 110. The proximal surface of the main body is substantially curved to adapt to the contour of the user's waist. The sizes of these two openings are set such that the waist belt 400 can pass through them, so that by fastening the waist belt 400 around the user's waist, the waist buckle 110 can be fixed relative to the user's body or alternatively set on the ground.

[0032] In Figure 2 this, the surface of the waist buckle 110 close to the observer or the user of the waist buckle assembly 100 can be considered as the proximal surface, while the surface of the waist buckle 110 facing away from the observer (refer to Figure 3 shown) can be considered as the distal surface. In the context of the present application, the proximal or distal interpretation of features can be understood similarly, that is, the side close to the user of the waist buckle assembly 100 can be defined as proximal, and the side facing away from the user of the waist buckle assembly 100 can be defined as distal.

[0033] As shown in the figure, the waist buckle assembly 100 further includes a housing 130. The housing 130 is rotatably mounted relative to the waist buckle 110 or the body of the waist buckle 110. For example, the housing 130 can rotate relative to the waist buckle 110 about an axis substantially perpendicular to the plane where Figure 2 is located. Or rather, the housing 130 can rotate about an axis parallel to the normal direction of the body of the waist buckle 110. A first pipe joint 151 and a second pipe joint 152 are provided in the housing 130. A channel is formed in the housing 130 to fluidly connect the two pipe joints 151 and 152. The two pipe joints 151 and 152 can be respectively connected to a first hose segment 210A and a second hose segment 210B. Within the scope of this application, the two pipe joints 151 and 152 can be regarded as a single pipe joint, and this pipe joint is connected in series within a hose composed of the first hose segment 210A and the second hose segment 210B. Additionally or alternatively, a regulating valve 153 is further provided on the housing 130. The regulating valve 153 is configured with a third pipe joint 154. For example, the third pipe joint 154 can be connected to an additional hose segment, and this additional hose segment can be used for supplying other gases such as oxygen. The regulating valve 153 is configured to be able to regulate the on / off of the third pipe joint 154 and / or the channel between the first pipe joint 151 and the second pipe joint 152.

[0034] As Figure 3 shown, a boss 113 extends integrally on the distal surface of the body of the waist buckle 110. For example, the boss 113 extends substantially axially from the distal surface of the body of the waist buckle 110 in a direction away from its proximal surface. Further referring to Figure 5 , a central recess 114 is concavely provided in the distal surface of the body of the waist buckle 110. The boss 113 and the central recess 114 can be coaxially arranged with each other. A through hole 114a is formed in the central recess 114.

[0035] As Figure 5 shown, a positioning sleeve 115 extends axially along the distal direction from the boss 113. The positioning sleeve 115 is coaxially arranged with the through hole 114a. As Figure 4 shown, a plurality of teeth 115a are formed on the inner peripheral wall of the positioning sleeve 115 at uniform intervals.

[0036] Turn to Figure 5, a receiving seat 131 axially extends from the housing 130 along the proximal direction, and a flap receiving sleeve 132 also axially extends from the housing 130 along the proximal direction within the hollow interior of the receiving seat 131. For example, the receiving seat 131 and the flap receiving sleeve 132 are coaxially arranged. When observed axially, the size of the receiving seat 131 is smaller than that of the flap receiving sleeve 132. That is to say, the free end of the flap receiving sleeve 132 axially protrudes from the receiving seat 131. For example, the flap receiving sleeve 132 can be configured to axially extend from the proximal surface 130a of the housing 130 within the hollow interior of the receiving seat 131. At the same time, a through hole 114a extends from the proximal surface 114c of the central recess 114 to the opposite distal surface 114b of the central recess 114. The flap receiving sleeve 132 is configured to be axially divided into a first section and a second section, and the first section is located proximal to the second section. Therefore, the outer peripheral dimension of the first section of the flap receiving sleeve 132 is set to be able to cooperate with the inner periphery of the through hole 114a (for example, both are circular and the circular outer diameter of the first section is equal to or slightly smaller than the inner diameter of the through hole 114a), so that when the first section of the flap receiving sleeve 132 is received by the through hole 114a, relative rotation can occur between the housing 130 and the waist buckle 110. In addition, the outer periphery of the positioning sleeve 115 is set to be cylindrical to facilitate insertion into the cylindrical inner wall of the receiving seat 131 and allow relative rotation between the housing 130 and the waist buckle 110. Therefore, when the positioning sleeve 115 is inserted into the receiving seat 131 and the first section of the flap receiving sleeve 132 is inserted into the through hole 114a, relative rotation can occur between the housing 130 and the waist buckle 110 about an axis, which is the axis mentioned above parallel to the normal direction of the body of the waist buckle 110 or the rotation axis between the housing 130 and the waist buckle 110. At the same time, when the housing 130 and the waist buckle 110 are connected to each other in the above manner, an accommodation space 133 is formed between the interior of the receiving seat 131 of the housing 130, particularly between the second section of the flap receiving sleeve 132 distal to the first section and the inner peripheral wall of the positioning sleeve 115 (for example, formed with a plurality of teeth 115a), as Figure 4 shown. For example, when the housing 130 and the waist buckle 110 are connected in place, the accommodation space 133 axially extends between the proximal surface 130a of the housing 130 and the distal surface 114b of the central recess 114. In an embodiment of the present application, when the housing 130 and the waist buckle 110 are connected in place, the outer peripheral end surface of the receiving seat 131 and the outer peripheral end surface of the boss 113 (which is formed around the positioning sleeve 115) are butt-jointed with each other, and the end surface of the positioning sleeve 115 inserted into the receiving seat 131 can be in contact with or slightly spaced from the proximal surface 130a of the housing 130, preferably without affecting the relative rotation between the housing 130 and the waist buckle 110.

[0037] A receiving hole 1321 is formed in the flap receiving sleeve 132. When observed axially, the receiving hole 1321 can extend from the end of the flap receiving sleeve 132 in the distal direction through the regions where the first section and the second section of the flap receiving sleeve 132 are located. For example, the receiving hole 1321 can be formed coaxially with the axis of rotation of the housing 130 relative to the waist buckle 110. When the positioning sleeve 115 is inserted into the receiving seat 131 and the first section of the flap receiving sleeve 132 is inserted into the through hole 114a in place, a fixing button 120 can be at least partially inserted into the receiving hole 1321 of the flap receiving sleeve 132 from the proximal surface of the waist buckle 110, particularly from the central recess 114 of the waist buckle 110. For example, the fixing button 120 has a head 121 and a fixing portion 122 axially extending from the head 120. The radial dimension of the head 121 is set to be larger than the radial dimension of the fixing portion 122. In addition, the receiving hole 1321 can be provided with internal threads, for example, to be screwed and fixed with the external threads provided on the outer surface of the fixing portion 122, so that the head 121 is fixedly abutted against the proximal surface of the central recess 114. In this way, the body of the waist buckle 110 is axially clamped between the housing 130 and the fixing button 120, particularly its head 121, to prevent the housing 130 from accidentally detaching from the waist buckle 110. It is preferable that the axial force exerted by the head 121 on the proximal surface of the central recess 114 does not affect the rotation of the housing 130 relative to the waist buckle 110. In an alternative embodiment, an interference fit can also be adopted between the fixing portion 122 and the receiving hole 1321 to achieve relative fixation.

[0038] Figure 4The section plane is generally perpendicular to the rotation axis between the housing 130 and the waist buckle 110 and passes through the area where the second section of the retainer receiving sleeve 132 is located. It can be seen that in the accommodating space 133, the second section of the retainer receiving sleeve 132 is not formed in a cylindrical manner like the first section, but is formed in a non-cylindrical manner. For example, the second section of the retainer receiving sleeve 132 is formed with two stepped portions 1322 and 1323 that are oppositely opened. These two oppositely opened stepped portions 1322 and 1323 can extend axially along the second section of the retainer receiving sleeve 132. A retainer 140 is disposed in the accommodating space 133 between the second section of the retainer receiving sleeve 132 and the inner peripheral wall of the positioning sleeve 115 formed with a plurality of teeth 115a. For example, the retainer 140 can be formed of an elastic sheet material, such as an elastic metal sheet material. In the illustrated embodiment, the retainer 140 can be formed by bending a metal sheet to have a contact end 141 in the middle and positioning ends 142 and 143 at opposite ends. For example, the positioning ends 142 and 143 can be formed by metal flanging. The retainer 140 is generally arcuate as a whole, so that in the accommodating space 133, the two positioning ends 142 and 143 of the retainer 140 can be respectively received in the stepped portions 1322 and 1323, and the contact end 141 of the retainer 140 is received between two adjacent teeth 115a of the positioning sleeve 115. In Figure 4 Observation shows that the straight line where the stepped portions 1322 and 1323 are located does not pass through the center of the second section of the retainer receiving sleeve 132. Inside the accommodating space 133, the retainer receiving sleeve 132 is configured such that its second section is spaced apart from the inner peripheral wall of the positioning sleeve 115 formed with a plurality of teeth 115a, so as not to affect the rotation of the housing 130 relative to the waist buckle 110.

[0039] The retainer 140 is formed in a compressed or slightly compressed manner between the second section of the retainer receiving sleeve 132 and the inner peripheral wall of the positioning sleeve 115 formed with a plurality of teeth 115a, especially in the thickness direction of the retainer 140 or in Figure 4 the radial direction observed, and the bent shape of the retainer 140 causes the positioning ends 142 and 143 to always apply a clamping force between the stepped portions 1322 and 1323, so that no matter how the housing 130 rotates relative to the waist buckle 110, the retainer 140 can always remain fixed relative to the positioning sleeve 115. In the illustrated embodiment, the shape of the contact end 141 of the retainer 140 can just be received in the valley portion between two adjacent teeth 115a, so as to apply a force to prevent relative rotation between the housing 130 and the waist buckle 110.

[0040] Such as Figure 4As shown, when there is relative rotation between the housing 130 and the waist buckle 110, the positioning sleeve 115 of the body of the waist buckle 110 can rotate relative to the housing 130, in particular its receiving seat 131 and the flap receiving sleeve 132, about a common axis of rotation (the direction of which is perpendicular to Figure 4 the plane of the paper). At the same time, the magnitude of the force exerted between the housing 130 and the waist buckle 110 by the flap 140 can be determined, for example, by factors such as the distance between the second section of the flap receiving sleeve 132 and the inner peripheral wall of the positioning sleeve 115, the degree of bending or elasticity or flexibility of the flap 140, and the magnitude of this force is such that it can prevent relative rotation between the housing 130 and the waist buckle 110, but if the user applies an appropriate external force, it can still continue to slightly deform the flap 140 so that its contact end 141 disengages from the original valley and allows the housing 130 to rotate relative to the waist buckle 110 (for example, it can cross one or more valleys during rotation); then, at an appropriate position, the contact end 141 engages again with another valley. That is to say, the force exerted between the housing 130 and the waist buckle 110 by the flap 140, in particular the force exerted by the contact end 141 on the positioning sleeve 115 of the housing 130, serves as a temporary positioning function. Therefore, the multiple valleys formed between multiple adjacent teeth 115a of the positioning sleeve 115 define different temporary rotation stop positions of the housing 130 relative to the waist buckle 110 or its body, that is, rotation gears.

[0041] In the above embodiment, the valleys formed between the flap 140 and each adjacent tooth 115a constitute a non-limiting example of the limiting feature between the housing 130 and the waist buckle 110. In an alternative embodiment not shown, the outer peripheral surface of the second section of the flap receiving sleeve 132 can be cylindrical and multiple teeth adjacent to each other along the circumference are formed thereon, and valleys are defined between these adjacent teeth; and a flap such as the flap 140 is fixed to the inner peripheral surface of the positioning sleeve 115 and the outer peripheral surface of the second section of the flap receiving sleeve 132 in a similar manner (for example, in this case, steps for fixing the two ends of the flap are formed in the inner peripheral surface of the positioning sleeve 115, so that the contact end of the flap located between the two ends can selectively engage a valley formed on the outer peripheral surface of the second section of the flap receiving sleeve 132 in a manner similar to the flap 140.

[0042] In an alternative embodiment for the illustrated embodiment, the flap 140 can also be replaced by an elastically expandable and retractable pin provided in the second section of the flap receiving sleeve 132; for example, such an elastic pin is provided in a radial blind hole of the flap receiving sleeve 132 and a spring is provided in the blind hole to ensure that the elastic pin is always subjected to a radially outward force, and the elastic pin can selectively engage in one of the multiple valleys in the inner peripheral surface of the positioning sleeve 115 to serve as a temporary stop for the rotation (between the housing 130 and the waist buckle 110).

[0043] Although specific embodiments of the present application are described in detail herein, they are given for illustrative purposes only and should not be considered as limiting the scope of the present application. In addition, those skilled in the art should understand that the embodiments described in this specification can be used in combination with each other. Various substitutions, changes, and modifications can be conceived without departing from the spirit and scope of the present application.

Claims

1. A waist buckle assembly, comprising: A waist buckle, an opening is provided on the body of the waist buckle for a belt to pass through and be fixed; A housing, the housing is connected to the body of the waist buckle in such a way that the body of the waist buckle can rotate around a rotation axis, the housing is provided with a pipe joint and is located on the far side of the waist buckle, and it is characterized in that the waist buckle assembly further comprises: A limiting feature provided between the housing and the waist buckle to define a plurality of rotation positions of the housing relative to the waist buckle.

2. The waist buckle assembly according to claim 1, wherein, The limiting feature includes a retaining piece provided on one of the housing and the body of the waist buckle, and a plurality of valleys provided on the other of the housing and the body of the waist buckle and spaced apart around the rotation axis, at least a part of the retaining piece can be selectively engaged in one of the plurality of valleys to make the housing stop rotating relative to the waist buckle in the position corresponding to the valley.

3. The waist buckle assembly according to claim 2, wherein It further includes a fixing button, the fixing button has a head and a fixing portion axially extending from the head, the fixing portion of the fixing button is inserted into the housing from the near-side surface of the body of the waist buckle so that the body of the waist buckle is axially clamped between the housing and the head.

4. The waist buckle assembly according to claim 3, characterized in that, The housing includes a receiving seat axially extending in the near-side direction and a retaining piece receiving sleeve axially extending in the hollow interior of the receiving seat, the receiving seat and the retaining piece receiving sleeve are coaxial; A boss integrally extends on the far-side surface of the body of the waist buckle, a positioning sleeve axially extends from the boss in the far-side direction, and a through hole is formed at the center of the body of the waist buckle; The retaining piece receiving sleeve is configured to be axially divided into a first section and a second section, the first section is located on the near side relative to the second section, the first section can be rotatably inserted into the through hole, the positioning sleeve can be rotatably inserted into the receiving seat, a receiving hole is formed in the positioning sleeve, and the fixing portion is inserted into the receiving hole and fixed there; And the receiving seat, the first section, the through hole, and the receiving hole of the positioning sleeve are coaxially arranged relative to the rotation axis.

5. The waist buckle assembly according to claim 4, characterized in that, A receiving space is defined between the second section of the retaining piece receiving sleeve and the inner peripheral surface of the positioning sleeve, and the limiting feature is located in the receiving space.

6. The waist buckle assembly according to claim 5, characterized in that, The retaining piece is formed by bending a metal sheet, having a contact end in the middle and positioning ends at opposite ends, two opposite stepped portions are formed on the second section of the retaining piece receiving sleeve to respectively receive the opposite positioning ends, and the plurality of valleys are evenly spaced on the inner peripheral wall of the positioning sleeve, and at each rotation position, the contact end of the retaining piece is engaged in one of the plurality of valleys.

7. The waist buckle assembly according to claim 6, characterized in that, The retaining piece is radially pressed and held between the second section of the retaining piece receiving sleeve and the inner peripheral wall of the positioning sleeve in the receiving space.

8. The waist buckle assembly according to claim 7, wherein, The opposite positioning ends of the retaining piece are received by the stepped portions and remain on the stepped portions whether or not the housing rotates relative to the body of the waist buckle.

9. The waist buckle assembly according to claim 8, wherein, The axis of rotation is along the normal direction of the body of the waist buckle or parallel to the normal direction; and / or, when observed in a plane perpendicular to the axis of rotation, the connecting line of the two stepped portions does not pass through the axis of rotation.

10. The waist buckle assembly according to claim 9, characterized in that, The proximal surface of the body of the waist buckle is curved.

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