Hinge structure assisting opening and closing

Abstract

The utility model provides a hinge structure assisting opening and closing, which relates to the technical field of hinges of opening and closing mechanisms and comprises a fixed seat, a rotating seat, a sliding part, an extension spring and a cam. The rotating seat is pivoted on the fixed seat through a first pivoting shaft; a sliding rail is arranged in the rotating seat, and the sliding piece is arranged in the sliding rail in a sliding mode. One end of the extension spring is connected with the first pivoting shaft, and the other end of the extension spring is connected with the connecting shaft; the cam is installed at the near end of the sliding piece, a rotating shaft is arranged on the fixing base, and the cam is kept abutting against the rotating shaft through the spring force of the extension spring. According to the hinge structure assisting opening and closing, in the closing process, the cam abuts against the rotating shaft, the sliding part is forced to slide away from the first pivoting shaft, the rotating base is prevented from being closed through the spring force of the extension spring, and slow and stable falling of the rotating base is achieved; and in the opening process, the rotating seat is opened through the spring force of the extension spring, the opening state is maintained, labor is saved, and convenience is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of opening and closing mechanism hinges, in particular to a hinge structure for auxiliary opening and closing. Background Art

[0002] At present, the hinge structure is one of the core opening and closing structures of copiers, scanners and other devices provided with an opening and closing mechanism. Copiers, scanners and other devices provided with a cover usually realize the opening and closing of the cover through the hinge structure.

[0003] A draft table for placing copied or scanned manuscripts is usually provided under the cover of a copier or scanner. When in use, the cover is flipped open, the manuscript to be copied or scanned is placed on the draft table, and then the cover is closed to copy or scan. During the opening and closing process, the cover acts as a rotating part and is opened and closed relative to the draft table by a hinge structure. However, the cover of a copier or scanner is heavy and requires a lot of effort to flip open; and since the draft table of a copier or scanner is usually made of glass, it needs to be lowered slowly when closing the cover. If you are not careful, the draft table glass may be damaged by the cover. After the cover is flipped open, the user needs to support the cover with his hands to keep the cover flipped open so that the manuscript to be copied or scanned can be placed on the draft table, which is laborious and troublesome. Utility Model Content

[0004] The purpose of the present invention is to provide a hinge structure that assists opening and closing, so as to solve at least one of the above-mentioned technical problems existing in the prior art.

[0005] In order to solve the above technical problems, the present invention provides an auxiliary opening and closing hinge structure, comprising: a fixed seat, a rotating seat, a sliding member, a tension spring and a cam;

[0006] The rotating seat is pivotally connected to the fixed seat via a first pivot shaft;

[0007] A slide rail is provided in the rotating seat, and the sliding member is slidably provided in the slide rail;

[0008] A connecting shaft is provided at the distal end of the sliding member (i.e., the side away from the first pivot axis), one end of the tension spring is connected to the first pivot axis, and the other end is connected to the connecting shaft;

[0009] The cam is mounted on the proximal end of the sliding member, and a rotating shaft is provided on the fixing seat, and the spring force of the tension spring is used to maintain the cam and the rotating shaft against each other;

[0010] During the closing process, the cam abuts against the rotating shaft, forcing the sliding member to slide away from the first pivot shaft, and utilizing the spring force of the extension spring to prevent the rotating seat from closing; during the opening process, the spring force of the extension spring is utilized to open the rotating seat and maintain the opened state.

[0011] The present application sets a tension spring, and during the closing process, the spring force of the tension spring is used to prevent the rotating seat from closing, thereby achieving a slow and smooth falling of the rotating seat; during the opening process, the spring force of the tension spring is used to assist the user in opening the rotating seat and maintaining the opened state of the rotating seat, which is labor-saving and convenient.

[0012] Furthermore, a ramp structure is provided on the end surface of the cam on the side abutting against the rotating shaft, the top of the ramp structure is provided on the side close to the first pivot axis, and the foot of the ramp structure is provided on the side away from the first pivot axis, so that during the opening and closing process, the rotating shaft slides on the ramp structure to push the sliding member away from the first pivot axis or guide the sliding member to slide toward the first pivot axis;

[0013] During the closing process, a force is applied to overcome the spring force of the extension spring, causing the rotating shaft to slide toward the top of the slope, pushing the sliding member away from the first pivot axis. The spring force of the extension spring is used to prevent the sliding member from sliding away from the first pivot axis, thereby achieving a torque of the rotating seat around the pivot axis, and the rotating seat is closed;

[0014] During the opening process, the rotating shaft slides toward the slope foot using the spring force of the tension spring, guiding the sliding member to slide toward the first pivot axis, thereby achieving the torque of the rotating seat around the pivot axis and the rotating seat opens.

[0015] Furthermore, a limit plate is provided on the slope foot to limit the maximum angle of the rotating seat;

[0016] When the rotating seat is opened to the maximum, the spring force of the tension spring is used to maintain the limit plate against the rotating shaft, thereby limiting the maximum angle of the rotating seat through the limit plate.

[0017] Preferably, the maximum opening angle of the rotating seat is 65°~90°.

[0018] Furthermore, a rotating wheel is provided on the rotating shaft, and the rotating wheel is rotatably mounted on the rotating shaft, and the rotating shaft abuts against the cam through the rotating wheel, so that the rotating shaft slides on the slope structure through the rotating wheel;

[0019] During the opening and closing process, the rotating wheel rolls on the slope structure, which reduces the friction with the slope structure and greatly improves the sensitivity and accuracy of the hinge structure that assists in opening and closing.

[0020] Furthermore, the rotating shaft is against the limiting plate through the rotating wheel, and a curved surface structure is provided on one side of the limiting plate against the rotating wheel. When the rotating seat is opened to the maximum, the curved surface structure fits tightly against the rotating wheel.

[0021] Furthermore, the slide rail is installed in the rotating seat, the distal end of the slide rail is pivotally connected to the distal end of the rotating seat via a second pivot shaft, and the proximal end of the slide rail is connected to the proximal end of the rotating seat via a first bolt.

[0022] Preferably, a first nut is mounted on the first bolt, and the first nut is arranged on a side of the rotating seat away from the slide rail, and is used for fixing the rotating seat and adjusting the distance between the rotating seat and the slide rail.

[0023] Preferably, the slide rail is pivotally connected to the fixed seat via the first pivot shaft, and the rotating seat is pivotally connected to the fixed seat via the slide rail.

[0024] Furthermore, conductive strips are provided on the left and right sides or one of the surfaces of the fixing seat, and the conductive strips are bent from both ends to the middle. The lower end of the conductive strip is fixedly connected to the side surface of the fixing seat, and the upper end is against the side surface of the fixing seat. The bent portion of the conductive strip is in contact with the slide rail, which is used for electrostatic conduction between the fixing seat and the slide rail.

[0025] Preferably, the lower end of the conductive bar is fixedly connected to the side surface of the fixing seat by a second bolt.

[0026] Furthermore, two grooves are provided at the distal end of the sliding member, and the two grooves are symmetrically arranged on both sides of the distal end of the sliding member. The two ends of the connecting shaft are respectively installed in the two grooves, and the spring force of the tension spring is used to maintain the connecting shaft against the distal end of the sliding member.

[0027] Furthermore, a plurality of first grooves are provided on the first pivot shaft, a plurality of second grooves are provided on the connecting shaft, the first grooves and the second grooves are symmetrically arranged, and both ends of the tension spring are respectively hooked in the first groove and the second groove.

[0028] Furthermore, a positioning pin is provided on a side of the proximal end of the sliding member away from the first pivot axis, and a positioning groove is provided on a side of the cam away from the first pivot axis. The positioning pin is inserted into the positioning groove for positioning the cam.

[0029] Preferably, the cam is fixedly connected to the proximal end of the sliding member via a third bolt.

[0030] By adopting the above technical solution, the utility model has the following beneficial effects:

[0031] The utility model provides an auxiliary opening and closing hinge structure, which is provided with a tension spring. During the closing process, the spring force of the tension spring is used to prevent the rotating seat from closing, thereby achieving a slow and stable drop of the rotating seat; during the opening process, the spring force of the tension spring is used to assist the user in opening the rotating seat and maintaining the opened state of the rotating seat, which is labor-saving and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 A schematic diagram of the structure of the auxiliary opening and closing hinge structure provided in an embodiment of the present utility model applied to an opening and closing mechanism;

[0034] Figure 2 for Figure 1 A schematic structural diagram of the auxiliary opening and closing hinge structure in an open state;

[0035] Figure 3 for Figure 2 A front view of the hinge structure for auxiliary opening and closing is shown;

[0036] Figure 4 for Figure 3 The AA section view shown;

[0037] Figure 5 for Figure 2 A schematic top view of the auxiliary opening and closing hinge structure is shown;

[0038] Figure 6 for Figure 2 The auxiliary opening and closing hinge structure shown is a schematic diagram of the proximal end when the fixing seat is not shown;

[0039] Figure 7 for Figure 2 A schematic structural diagram of the auxiliary opening and closing hinge structure in a closed state;

[0040] Figure 8 for Figure 7 A front view of the hinge structure for auxiliary opening and closing is shown;

[0041] Figure 9 for Figure 8 BB cross-section shown;

[0042] Figure 10 for Figure 2 Right side view of the cam shown;

[0043] Figure 11 A schematic structural diagram of an auxiliary opening and closing hinge structure in an open state provided by another embodiment of the present invention;

[0044] Figure 12 for Figure 11 A schematic structural diagram of the auxiliary opening and closing hinge structure in a closed state;

[0045] Figure 13 for Figure 12 A rear view of the hinge structure for assisting opening and closing is shown;

[0046] Figure 14 A schematic structural diagram of a sliding member of a hinge structure for auxiliary opening and closing provided in an embodiment of the present invention.

[0047] Reference numerals:

[0048] 1-fixed seat; 11-first pivot axis; 111-first groove; 12-rotating axis; 121-rotating wheel; 13-conductive strip; 131-bending part; 132-second bolt; 2-rotating seat; 21-slide rail; 22-sliding member; 22a-sliding member body; 22b-slide plate; 221-groove; 222-locating pin; 223-locating hole; 224-locating column; 23-connecting shaft; 231-second groove; 24-tension spring; 25-cam; 251-slope structure; 251a-slope top; 251b-slope foot; 252-limiting plate; 253-arc surface structure; 254-locating groove; 255-third bolt; 26-second pivot axis; 27-first screw; 271-first nut; 3-copy table / fixed member; 4-cover / rotating member. DETAILED DESCRIPTION

[0049] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0050] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0052] The present invention will be further explained below in conjunction with specific implementation methods.

[0053] It should also be noted that the following specific embodiments or specific implementation methods are a series of optimized settings listed in the present invention to further explain the specific content of the utility model, and these settings can be combined or used in association with each other.

[0054] Example 1

[0055] like Figure 1-10 As shown, the present embodiment provides an auxiliary opening and closing hinge structure, comprising: a fixed base 1, a rotating base 2, a sliding member 22, a tension spring 24 and a cam 25; the rotating base 2 is pivotally connected to the fixed base 1 via a first pivot axis 11; the fixed base 1 is usually connected to a platen 3 of a copier or scanner, or a fixed member 3 of other opening and closing mechanisms; the rotating base 2 is usually connected to a cover 4 of a copier or scanner, or a rotating member 4 of other opening and closing mechanisms; a slide rail 21 is provided in the rotating base 2, and the sliding member 22 is slidably provided in the slide rail 21; a connecting shaft 23 is provided at the distal end of the sliding member 22 (i.e., a side away from the first pivot axis 11), one end of the tension spring 24 is connected to the first pivot axis 11, and the other end is connected to the connecting shaft 23; the cam 25 is mounted on the proximal end of the sliding member 22, a rotating shaft 12 is provided on the fixed base 1, and the spring force of the tension spring 24 is used to maintain the cam 25 against the rotating shaft 12;

[0056] During the closing process, the cam 25 abuts against the rotating shaft 12, forcing the sliding member 22 to slide away from the first pivot shaft 11, and utilizing the spring force of the tension spring 24 to prevent the rotating seat 2 from closing; during the opening process, the spring force of the tension spring 24 is utilized to open the rotating seat 2 and maintain the opened state.

[0057] The present application sets a tension spring 24. During the closing process, the spring force of the tension spring 24 is used to prevent the rotating seat 2 from closing, thereby achieving a slow and smooth falling of the rotating seat 2; during the opening process, the spring force of the tension spring 24 is used to assist the user in opening the rotating seat 2 and maintaining the opened state of the rotating seat 2, which is labor-saving and convenient.

[0058] Reference Figure 4 、 Figure 9 and Figure 10 As shown, based on the above technical solution, further preferably, a ramp structure 251 is provided on the end surface of the cam 25 on the side abutting against the rotating shaft 12, the top 251a of the ramp structure 251 is provided on the side close to the first pivot shaft 11, and the foot 251b of the ramp structure 251 is provided on the side away from the first pivot shaft 11, so that during the opening and closing process, the rotating shaft 12 slides on the ramp structure 251 to push the sliding member 22 away from the first pivot shaft 11 or guide the sliding member 22 to slide toward the first pivot shaft 11;

[0059] During the closing process, the spring force of the tension spring 24 is overcome by force, and the rotating shaft 12 slides toward the slope top 251a, pushing the sliding member 22 away from the first pivot axis 11. The spring force of the tension spring 24 prevents the sliding member 22 from sliding away from the first pivot axis 11, thereby achieving the torque of the rotating seat 2 around the pivot axis, and the rotating seat 2 is closed.

[0060] During the opening process, the spring force of the tension spring 24 is used to slide the rotating shaft 12 toward the slope foot 251b, guiding the sliding member 22 to slide toward the first pivot axis 11, thereby realizing the torque of the rotating seat 2 around the pivot axis, and the rotating seat 2 is opened.

[0061] Reference Figure 1 、 Figure 2 and Figure 4As shown, a limit plate 252 is further provided on the slope foot 251b to limit the maximum tilting angle of the rotating base 2. When the rotating base 2 is fully tilted, the spring force of the tension spring 24 maintains the limit plate 252 against the rotating shaft 12, thereby limiting the maximum tilting angle of the rotating base 2. More preferably, the maximum tilting angle of the rotating base 2 is between 65° and 90°. In this embodiment, the maximum tilting angle of the rotating base 2 is 70°.

[0062] Reference Figure 4 、 Figure 9 As shown, further, a rotating wheel 121 is provided on the rotating shaft 12, and the rotating wheel 121 is rotatably mounted on the rotating shaft 12, and the rotating shaft 12 abuts against the cam 25 through the rotating wheel 121, so that the rotating shaft 12 slides on the ramp structure 251 through the rotating wheel 121;

[0063] During the opening and closing process, the rotating wheel 121 rolls on the slope structure 251, which reduces the friction with the slope structure 251 and greatly improves the sensitivity and accuracy of the hinge structure that assists in opening and closing.

[0064] More preferably, the rotating shaft 12 is abutted against the limiting plate 252 through the rotating wheel 121, and a curved surface structure 253 is provided on one side surface of the limiting plate 252 abutting against the rotating wheel 121. When the rotating seat 2 is opened to the maximum, the curved surface structure 253 fits tightly against the rotating wheel 121.

[0065] In this embodiment, the slide rail 21 is installed in the rotating base 2, the distal end of the slide rail 21 is pivotally connected to the distal end of the rotating base 2 via a second pivot shaft 26, and the proximal end of the slide rail 21 is connected to the proximal end of the rotating base 2 via a first bolt 27.

[0066] More preferably, a first nut 271 is installed on the first bolt 27 . The first nut 271 is arranged on the side of the rotating base 2 away from the slide rail 21 , and is used to fix the rotating base 2 and adjust the distance between the rotating base 2 and the slide rail 21 .

[0067] In this embodiment, the slide rail 21 is pivotally connected to the fixed base 1 via the first pivot shaft 11 , and the rotating base 2 is pivotally connected to the fixed base 1 via the slide rail 21 .

[0068] Furthermore, two grooves 221 are provided at the distal end of the sliding member 22, and the two grooves 221 are symmetrically arranged on both sides of the distal end of the sliding member 22. The two ends of the connecting shaft 23 are respectively installed in the two grooves 221, and the spring force of the tension spring 24 is used to maintain the connecting shaft 23 against the distal end of the sliding member 22.

[0069] Reference Figure 6 、 Figure 8 As shown, in this embodiment, a plurality of first grooves 111 are provided on the first pivot shaft 11, and a plurality of second grooves 231 are provided on the connecting shaft 23. The first grooves 111 and the second grooves 231 are symmetrically arranged, and the two ends of the tension spring 24 are respectively hooked in the first groove 111 and the second groove 231.

[0070] Reference Figure 5 As shown, more preferably, a positioning pin 222 is provided on the side of the proximal end of the sliding member 22 away from the first pivot axis 11, and a positioning groove 254 is provided on the side of the cam 25 away from the first pivot axis 11, and the positioning pin 222 is inserted into the positioning groove 254 for positioning the cam 25.

[0071] Furthermore, the cam 25 is fixedly connected to the proximal end of the sliding member 22 via a third bolt 255 .

[0072] The utility model provides a tension spring 24. During the closing process, the spring force of the tension spring 24 is used to prevent the rotating seat 2 from closing, thereby achieving a slow and stable drop of the rotating seat 2; during the opening process, the spring force of the tension spring 24 is used to assist the user in opening the rotating seat 2 and maintaining the opened state of the rotating seat 2, which is labor-saving and convenient.

[0073] Example 2

[0074] This embodiment is basically the same as embodiment 1, except that:

[0075] like Figure 11-13 As shown, this embodiment provides an auxiliary opening and closing hinge structure, wherein a conductive strip 13 is provided on the left and right sides or one of the surfaces of the fixing base 1, and the conductive strip 13 is bent from both ends to the middle, and the lower end of the conductive strip 13 is fixedly connected to the side surface of the fixing base 1, and the upper end is against the side surface of the fixing base 1, and the bent portion 131 of the conductive strip 13 is in contact with the slide rail 21, for electrostatic conduction between the fixing base 1 and the slide rail 21.

[0076] More preferably, the lower end of the conductive bar 13 is fixedly connected to the side surface of the fixing base 1 through a second bolt 132 .

[0077] Example 3

[0078] This embodiment is basically the same as embodiment 1, except that:

[0079] like Figure 14 As shown, this embodiment provides an auxiliary opening and closing hinge structure, wherein the sliding member 22 includes: a sliding member body 22a and two slide plates 22b;

[0080] The two slides 22b are symmetrically arranged on the left and right sides of the sliding body 22a. The sliding body 22a is slidably installed in the slide rail 21 through the two slides 22b, reducing the friction with the slide rail 21 and greatly improving the sensitivity and accuracy of the auxiliary opening and closing hinge structure.

[0081] More preferably, a plurality of positioning posts 224 are provided on the slide plate 22b, and a plurality of positioning holes 223 are provided on both the left and right sides of the sliding body 22a. The positioning posts 224 are inserted into the positioning holes 223 for positioning and installing the slide plate 22b.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hinge structure for auxiliary opening and closing, characterized in that: include: Fixed seat, rotating seat, slide, tension spring and cam; The rotating seat is pivotally connected to the fixed seat via a first pivot shaft; A slide rail is provided in the rotating seat, and the sliding member is slidably provided in the slide rail; A connecting shaft is provided at the distal end of the sliding member, one end of the tension spring is connected to the first pivot shaft, and the other end is connected to the connecting shaft; The cam is mounted on the proximal end of the sliding member, and a rotating shaft is provided on the fixing seat, and the spring force of the tension spring is used to maintain the cam and the rotating shaft against each other; During the closing process, the cam abuts against the rotating shaft, forcing the sliding member to slide away from the first pivot shaft, and utilizing the spring force of the extension spring to prevent the rotating seat from closing; During the opening process, the rotating seat is opened by the spring force of the tension spring and the opened state is maintained.

2. The hinge structure for auxiliary opening and closing according to claim 1, characterized in that: A slope structure is provided on the end face of one side where the cam abuts against the rotating shaft, the top of the slope structure is provided on the side close to the first pivot shaft, and the foot of the slope structure is provided on the side away from the first pivot shaft. During the opening and closing process, the rotating shaft is used to slide on the slope structure to push the sliding part away from the first pivot shaft or guide the sliding part to slide toward the first pivot shaft.

3. The hinge structure for auxiliary opening and closing according to claim 2, characterized in that: A limit plate is provided on the slope foot to limit the maximum angle at which the rotating seat can be opened.

4. The hinge structure for auxiliary opening and closing according to claim 3, characterized in that: A rotating wheel is provided on the rotating shaft. The rotating wheel is rotatably mounted on the rotating shaft. The rotating shaft abuts against the cam through the rotating wheel, so that the rotating shaft slides on the slope structure through the rotating wheel.

5. The hinge structure for auxiliary opening and closing according to claim 4, characterized in that: The rotating shaft abuts against the limiting plate through the rotating wheel. A curved surface structure is provided on one side of the limiting plate abutting against the rotating wheel. When the rotating seat is opened to the maximum, the curved surface structure fits tightly against the rotating wheel.

6. The hinge structure for auxiliary opening and closing according to claim 1, characterized in that: The slide rail is installed in the rotating seat, the distal end of the slide rail is pivotally connected to the distal end of the rotating seat via a second pivot shaft, and the proximal end of the slide rail is connected to the proximal end of the rotating seat via a first bolt.

7. The hinge structure for auxiliary opening and closing according to claim 1, characterized in that: Conductive strips are provided on the left and right sides or one of the surfaces of the fixing seat, and the conductive strips are bent from both ends to the middle. The lower end of the conductive strip is fixedly connected to the side surface of the fixing seat, and the upper end is against the side surface of the fixing seat. The bent portion of the conductive strip is in contact with the slide rail, which is used for electrostatic conduction between the fixing seat and the slide rail.

8. The hinge structure for auxiliary opening and closing according to claim 1, characterized in that: Two grooves are provided at the distal end of the sliding member, and the two grooves are symmetrically arranged on both sides of the distal end of the sliding member. The two ends of the connecting shaft are respectively installed in the two grooves, and the spring force of the tension spring is used to maintain the connecting shaft and the distal end of the sliding member against each other.

9. The hinge structure for auxiliary opening and closing according to claim 1, characterized in that: The first pivot shaft is provided with a plurality of first grooves, the connecting shaft is provided with a plurality of second grooves, the first grooves and the second grooves are symmetrically arranged, and the two ends of the tension spring are respectively hooked in the first groove and the second groove.

10. The hinge structure for auxiliary opening and closing according to claim 1, characterized in that: A positioning pin is provided on a side of the proximal end of the sliding member away from the first pivot axis, and a positioning groove is provided on a side of the cam away from the first pivot axis. The positioning pin is inserted into the positioning groove for positioning the cam.

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