JP2011215204A - Opening/closing apparatus for upper unit case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact opening/closing apparatus that moves in the direction in which an upper unit case 3 is closed only when the case 3 is pushed down and can smoothly move when opened and rotated.SOLUTION: A lower unit case 2 and the upper unit case 3 are connected by a hinge part 4 on one side so as to be rotatable. The lower unit case 2 is provided with a linear and horizontal lower guide member 6 such that it extends from the hinge part 4 in the direction of an open end side. The upper unit case 3 is provided with a downwardly convex upper guide member 7 such that it extends from the hinge part 4 side to an open end side. An opening/closing linking unit 10 having, on the same axis, a second rotating body 13 fitted on the lower guide member 6 so as to be inseparable and rotatable and a first rotating body 12 fitted on the upper guide member 7 so as to be inseparable and rotatable is movably connected to the lower guide member 6 and upper guide member 7.

Description

  The present invention relates to an opening / closing device for an upper unit case that is attached to a lower unit case so as to be capable of opening and closing, and more specifically, an upper unit that can slow the operation of the upper unit case in the closing direction. The present invention relates to a configuration of a case opening and closing device.

  Conventionally, in image recording apparatuses such as printers, facsimiles, and copiers, one side of the upper unit case on which the document reading unit is mounted is connected via a hinge to the lower unit case on which the paper feeding unit, recording unit, and the like are mounted. Various configurations have been proposed in which the upper unit case is mounted so that it can be opened and closed, and when the upper unit case is closed from a wide open state during maintenance or paper jam handling, the upper unit case is braked in the closing end section. Yes.

  For example, in the technique described in Patent Document 1, the upper unit case and the lower unit case are connected by a gas spring, and a coil spring is disposed downward on the lower surface free end side of the upper unit case to close the upper unit case. A configuration is disclosed in which one end of the coil spring is supported by a receiving portion in the lower unit case in the end section to prevent the upper unit case from closing suddenly.

  On the other hand, in Patent Document 2, an arc-shaped guide member (guide member) projecting downward on the side surface of the upper unit case (cover) is formed with an arc-shaped guide groove, and the lower unit case (housing). The bolt shaft provided on one side is inserted into the guide groove, and the guide member is sandwiched between the head of the bolt and the spring material so that the upper unit case can be held at an arbitrary rotation angle. Furthermore, a technique is disclosed in which the upper unit case is biased upward by a torsion spring provided in the lower unit case when the upper unit case is closed with respect to the lower unit case.

JP-A-11-38714 (see FIGS. 1 and 2) Japanese Utility Model Publication No. 1-229815 (see FIGS. 3 and 6)

  However, the switchgears of Patent Documents 1 and 2 require a large number of parts and large parts such as a gas spring. In order to slow down the speed when closing the upper unit case with respect to the lower unit case, it may be possible to provide a linear oil damper instead of the gas spring or add a rotary oil damper to the hinge part. In this case, there is a problem that the configuration of the switchgear becomes more complicated or the ratio of the switchgear to the entire product such as the lower unit case increases, resulting in an increase in the size of the product.

  An object of the present invention is to simplify and downsize components of a switchgear.

  In order to achieve the above object, the upper unit case opening and closing device according to the first aspect of the present invention is mounted so that the lower unit case and the upper unit case can be vertically opened and closed through a hinge provided on one side. The lower unit case includes a lower guide member extending from the hinge portion side to the open end portion side, and the upper unit case includes an upper guide member extending from the hinge portion side to the open end portion side. One of the lower guide member and the upper guide member is formed in a convex curve shape, and the other is formed in a straight and horizontal shape, and is movably connected to the lower guide member and the upper guide member. A first rotating body is movably provided along the upper guide member, and a second rotating body is provided movably along the lower guide member. The first The rotating body and the second rotating body are provided so as to be rotatable coaxially with each other horizontally, and as the upper unit case is opened with respect to the lower unit case, the open / close coupling body moves along the upper and lower members. The open / close coupling body moves from the hinge part side along the upper and lower members as the upper unit case moves from the open end side to the hinge part side and closes the upper unit case with respect to the lower unit case. It is configured to move sequentially toward the open end side.

  According to a second aspect of the present invention, in the upper unit case opening / closing device according to the first aspect, the weight of the upper unit case and the weight of the upper unit case can be adjusted regardless of the position of the upper / lower guide member. The magnitude of the horizontal component at the position of the first rotating body of the resultant force of the pressing force applied to the upper unit case is equal to the vertical component of the pressing force and the magnitude of the horizontal friction force due to the weight of the open / close coupling body. The opening / closing posture of the upper unit case is maintained when the pressing force is set to be greater than or equal to the sum of the horizontal components of the resistance force acting on the opening / closing connector. It is composed.

  According to a third aspect of the present invention, in the opening / closing apparatus for the upper unit case according to the first or second aspect, the open / close coupling body includes a friction member between the first rotating body and the second rotating body. As the first unit is disposed and closes the upper unit case with respect to the lower unit case, the first rotating body abuts against the upper guide surface of the upper guide member and rolls, and the second rotating body is moved to the lower guide. By rolling in contact with the lower guide surface of the member, the first rotating body and the second rotating body rotate in directions opposite to each other, and the first rotating body and the second rotating body are in contact with the friction. It is comprised so that each may contact | abut to a member and may receive resistance force.

  According to a fourth aspect of the present invention, in the upper unit case opening / closing device according to the third aspect, the first and second rotating bodies are each separated by two large-diameter roller portions on the same axis with the small-diameter roller portion interposed therebetween. And the protrusions on the lower guide surface of the upper guide member and the protrusions on the upper guide surface of the lower guide member are formed so as to face each of the small diameter roller parts, During the operation of closing the unit case with respect to the lower unit case, the two large-diameter rollers in the first rotating body roll while being pressed against the upper guide surface of the upper guiding member, and in the second rotating body The two large diameter roller portions are configured to roll while being pressed by the lower guide surface of the lower guide member.

  According to a fifth aspect of the present invention, in the upper unit case opening and closing device according to the fourth aspect of the present invention, the small diameter roller portions, the protrusions on the lower guide surface of the upper guide member, and the upper side of the lower guide member The ridge portion on the guide surface is a member having a small coefficient of friction, and when the upper unit case is opened with respect to the lower unit case, the small diameter roller portion of the first rotating body is connected to the upper guide member. It is configured to roll while being slidably contacted with the ridge portion provided on the lower guide surface, and to be rolled while being slidably contacted with the ridge portion provided on the upper guide surface of the lower guide member. It is what has been.

  According to the first aspect of the present invention, the open / close coupling body is movably coupled to the lower guide member in the lower unit case and the upper guide member in the upper unit case. A rotating body is provided to be movable along the upper guide member, a second rotating body is provided to be movable along the lower guide member, and the first rotating body and the second rotating body are horizontally coaxial. Since each is provided so as to be rotatable, the structure can be formed extremely compactly.

  In addition, since either the lower guide member or the upper guide member is formed in a convex curve shape, the other is formed in a linear shape, and only the open / close connection body connected to be movable along both guide members, The structure is simple and can be miniaturized.

  According to the invention described in claim 2, the upper unit case does not move in the closing direction unless the user applies a downward pressing force even when the open / close coupling body is in any position of the upper and lower guide members. When the user removes his / her hand from the upper unit case, it is safe because it does not close carelessly.

  According to the second to fourth aspects of the invention, only when a load (load) is applied in a direction in which the upper unit case is closed, the open / close coupling body moves in a direction away from the hinge portion, and the movement Since the speed does not increase, there is an effect that it can be closed slowly.

  According to invention of Claim 5, when opening an upper unit case, there exists an effect that it can open easily.

  Furthermore, according to the invention described in claims 4 and 5, the first and second rotating bodies are arranged such that two large-diameter rollers on the same axis are separated from each other with the small-diameter roller interposed therebetween, and the upper guide Since the protrusions on the upper and lower guide surfaces of the member and the protrusions on the upper and lower guide surfaces of the lower guide member are formed so as to face each of the small diameter roller portions, the upper unit case can be opened and closed. During operation, when the large-diameter roller part moves in the axial direction, each ridge prevents the movement, so that each of the rotating bodies cannot fall off in the direction of the central axis with respect to the upper and lower guide members. Thus, there is an effect that the open / close coupling body is safe without being accidentally detached.

(A) is a schematic side view which shows the state in the middle of the upper unit case opening with respect to the lower unit case of 1st Example, (B) is a schematic side view of the state which closed the upper unit case. FIG. 2 is an enlarged cross-sectional view taken along the line II-II in FIG. It is a side view of the notch of an opening-closing coupling body and an urging | biasing means. It is operation | movement explanatory drawing of 1st Example. It is a graph for action explanation.

  A first embodiment of the present invention will be described with reference to FIGS.

  An image recording apparatus 1 according to the present embodiment is an application of the present invention to a multi-function device (MFD) having a printer function, a copy function, a scanner function, and a facsimile function. As shown in FIG. 1B, the upper unit case 3 is connected to one side portion of the synthetic resin lower unit case 2 in the image recording apparatus 1 via a hinge portion 4 so as to be vertically rotatable.

  Although not shown, an ink jet type recording unit is disposed above the paper feed cassette in the lower unit case 2, and the paper (recorded medium) fed from the paper feed cassette is placed on the rear side. The paper is transported to the recording section through a U-turn-shaped transport path body that is detachably disposed, and the recorded paper is discharged from an opening that opens above the paper feed cassette and on the side surface of the lower unit case 2. It is comprised so that. The paper feed cassette is also arranged so that it can be inserted from the opening.

  The upper unit case 3 includes an automatic document feeder and an image reading device for reading a document in a copy function and a facsimile function, a document placement glass plate and a document cover that covers the upper surface, various operation buttons and a liquid crystal display. An operation panel unit provided with a display unit or the like is provided (both not shown).

  Next, an opening / closing device capable of opening and closing the lower unit case 2 and the upper unit case 3 of the present invention will be described. Both unit cases 2 and 3 are respectively provided with a lower guide member 6 and an upper guide member 7 extending from the hinge 4 side to the open end side. The open / close coupling body 10 disposed between the lower guide member 6 and the upper guide member 7 includes a first rotary body 12 movable along the upper guide member 7 and a second rotary body movable along the lower guide member 6. And 13 are rotatably mounted on one spindle 14 fixed to a frame 11 having an arbitrary shape. In FIG. 4, the first rotating body 12 is not shown.

  In the first embodiment, the lower guide member 6 is formed so as to extend substantially horizontally and linearly from the hinge portion 4 side toward the open end portion side. On the other hand, the upper guide member 7 is formed so as to extend in a downward convex curved line shape from the hinge portion 4 toward the open end portion (see FIGS. 1A and 1B).

  The upper guide member 7 is disposed on the inner surface of the side plate of the upper unit case 3 such that the guide groove 23 opens inward (see FIGS. 2A and 2B). In a state where the upper unit case 3 is closed with respect to the lower unit case 2, the upper guide member 7 is arranged so as not to interfere with the lower unit case 2. The lower guide member 6 is located outside.

  As shown in FIGS. 2 (A) and 2 (B), a disc-like brake member 15 as a friction member having a large friction coefficient, such as rubber, fitted into the central portion in the axial direction of the support shaft 14 is a frame. 11 or the support shaft 14 is fixed with an adhesive or the like so as not to rotate. The first rotating body 12 and the second rotating body 13 are disposed on both sides of the frame 11 and the brake member 15.

  The first rotating body 12 is arranged such that the two large diameter roller portions 12a and 12b sandwich the small diameter roller portion 12c, and is fixed with an adhesive or the like so as to rotate integrally. Similarly, the second rotating body 13 is also arranged such that the two large diameter roller portions 13a and 13b sandwich the small diameter roller portion 13c, and is fixed with an adhesive or the like so as to rotate integrally. The small diameter roller portions 12c and 13c are made of a material having a smaller friction coefficient than the large diameter roller portions 12a, 12b, 13a, and 13b.

  As shown in FIGS. 2 (A) and 2 (B), the lower guide member 6 is formed on the upper side surface of the lower unit case 2, and includes two large diameter roller portions 13a in the second rotating body 13, The guide groove 20 has a vertical dimension slightly larger than the diameter of 13b, and ridges 21 and 22 that protrude between the guide grooves 20 so as to face each other from above and below. The upper and lower guide surfaces 20a and 20b of the guide groove 20 face the outer peripheral surfaces of the two large diameter roller portions 13a and 13b, and the upper and lower protrusions 21 and 22 face the outer peripheral surface of the small diameter roller portion 13c.

  Similarly, the upper guide member 7 is formed on the inner surface of the side plate of the upper unit case 3, and has a guide groove 23 having a vertical dimension slightly larger than the diameter of the two large diameter roller portions 12 a and 12 b in the first rotating body 12. The protrusions 24 and 25 protrude so as to face each other between the guide grooves 23 from above and below. The upper and lower guide surfaces 23a and 23b of the guide groove 23 face the outer peripheral surfaces of the two large diameter roller portions 12a and 12b, and the upper and lower protrusions 24 and 25 face the outer peripheral surface of the small diameter roller portion 12c.

  In the first rotating body 12 and the second rotating body 13, two large diameter roller portions 12a and 12b (13a and 13b) on the same axis (support shaft 14) are separated with a small diameter roller portion 12c (13c) interposed therebetween. The upper and lower guide surfaces 20a and 20b of the lower guide member 6 are formed so that the protruding ridges 24 and 25 on the upper and lower guide surfaces 23a and 23b of the upper guide member 7 are formed so as to face the small diameter roller portion 13c. Since the protrusions 21 and 22 are formed so as to be opposed to the small diameter roller portion 12c, the large diameter roller portions 12a and 12b (13a and 13b) move in the axial direction when the upper unit case is opened and closed. Therefore, the rotating bodies 12 and 13 cannot be detached from the upper and lower guide members 7 and 6 in the direction of the center axis, and the open / close coupling body 10 is not accidentally detached. That.

  As the user opens the upper unit case 3 with respect to the lower unit case 2, the open / close coupling body 10 sequentially moves along the upper and lower members 6 and 7 in a direction approaching the hinge portion 4 side from the open end side. Is configured to do. Further, as the upper unit case 3 is closed with respect to the lower unit case 2, the open / close coupling body 10 sequentially moves along the upper and lower members 6 and 7 in the direction approaching the open end side from the hinge portion 4 side. It is configured.

  Next, the operation of the open / close coupling body 10 in the open / close device will be described. As shown in FIG. 4A, the weight (in the vertical direction) of the upper unit case 3 acts on the center of gravity G (position separated from the position of the hinge part 4 (origin O) by a distance a). Suppose that the user presses the upper unit case 3 by hand with a force of (load W) at a position separated from the origin O by a distance b on the free end side, for example. Further, an angle (2π−θ) formed by a straight line passing through the center of gravity G and the load W from the origin O and the X axis is defined.

  During the closing operation, the upper unit case 3 is supported by the first rotating body 12 of the opening / closing connecting body 10, while the second rotating body 13 of the opening / closing connecting body 10 is guided by the guide groove 20 of the lower guide member 6 parallel to the X axis. It can be moved along the lower guide surface. It is assumed that the position (contact P) where the first rotating body 12 is in contact with the upper guide surface of the rail groove 16 of the upper guide member 7 is separated from the origin O by a distance d in the X-axis direction. In that case, the contact P is located on the X axis. Assuming that the angle k between the tangent line T of the upper guide member 7 at the contact point P with the upper guide surface of the guide groove 23 and the X axis is k = α−θ. If the contact P is not on the X axis, the relationship between the angles k, α, and θ is k = 2π−θ = α−θ.

  In addition, when the upper guide member 7 has a downwardly convex curved shape, it is obvious that the contact point P is located closer to the hinge portion 4 than the central axis of the first rotating body 12.

When the support reaction force F at the contact P is set, the balance equation of the moment around the hinge portion 4 (origin O) is a * mg * cos (2π−θ) + W * b = d * F * cosk. (* Is a multiplication symbol.) Since cos (2π−θ) = cosθ,
F = [a * mg * cosθ + W * b] / [d * cosk] Equation (1)
Assuming that the force S in the positive direction of the x axis at the contact P is S = (X-axis direction component due to the weight of the upper unit case 3 and the load W) − (the upper guide member 7 due to the weight and the load W of the upper unit case 3) (X-axis direction component of the frictional force at this point) − (X-axis direction component of the load acting on the open / close coupling body 10). Here, (the X-axis direction component of the load acting on the open / close coupling body 10) = N, and the coefficient of static friction between the upper guide member 7 and the first rotating body 12 is μ.

Therefore, S = (F * sink) − (μ * F * cosk) −N (2)
It becomes.

  The load N acting on the open / close coupling body 10 is, for example, a frictional force or a braking force when the open / close coupling body 10 moves along the lower guide member 6 of the lower unit case 2, or the rotating body 12 (13, 13, 14) and the contact frictional force between the guide members 6 and 7 and the brake mechanism for stopping the rotation of the rotating body 12 (13, 14).

  In the present embodiment, the user presses the upper unit case 3 with the load W during the closing operation, so that the peripheral surfaces of the large-diameter roller portions 12a and 12b in the first rotating body 12 as shown in FIG. The upper side is pressed against the upper guide surface 23 a of the upper guide member 7. On the other hand, the lower side of the circumferential surface of the large diameter rollers 13 a and 13 b in the second rotating body 13 is pressed against the lower guide surface 20 b in the lower guide member 6. Therefore, the first rotating body 12 and the second rotating body 13 rotate in opposite directions. For example, in the side view of FIG. 1 (A), when the opening / closing connecting body 10 moves in the right direction away from the hinge portion 4 by the closing operation, the first rotating body 12 rotates counterclockwise, and the second rotating body 13 It will rotate clockwise.

  And the brake member 15 is arrange | positioned between the 1st rotary body 12 and the 2nd rotary body 13, and the side surface of the large diameter roller part 12b in the 1st rotary body 12 and 2nd on the brake member 15 both side surface. Since the side surfaces of the large-diameter roller portion 13b of the rotating body 13 are in sliding contact with each other, the open / close coupling body 10 receives a load N in the direction opposite to the moving direction (leftward) due to the frictional resistance.

Substituting equation (1) into equation (2) to obtain the value of S,
S = [b * (sink−μ * cos k) / d * cos k] W +
[A * mg * cos θ * (sink−μ * cos k)] / (d * cosk) −N (3)

Here, U = [b * (sink−μ * cosk) / (d * cosk)],
V = a * mg * cos θ * U / b. Since U and V are constants determined when the weight of the upper unit case 3 and the position of the first rotating body 12 are determined, the function S is a linear function of W.

  That is, the function of Expression (3) is S (W) = U * W + (V−N) (Expression (4)).

  As shown in the graph of FIG. 5, W is taken on the horizontal axis and S is taken on the vertical axis. Then, when the condition (S ≧ 0) where the open / close coupling body 10 at any position starts to move in the closing direction by applying W (W ≧ 0), U needs to be a positive value. And the condition of w1 = (V−N) ≧ 0 should be satisfied. If U is negative, V will also be negative and the upper unit case 3 will bite and will not move. If U is positive and w1 is negative, a force in the positive direction is always applied to the open / close coupling body 10 (moving body). Therefore, the upper unit case 3 cannot be held even if the hand is released.

  As described above, in the first embodiment, the upper guide member 7 is formed in a downwardly convex curved shape, while the lower guide member is formed in a horizontal and linear shape, and the opening / closing connector 10 can be moved therebetween. Then, when the user applies a downward pressing force of W to an arbitrary portion of the upper unit case 3, the open / close coupling body 10 moves in the closing direction (a direction away from the hinge portion 4), and the pressing force is applied. When not (that is, not pressed), the open / close coupling body 10 can be stopped at an arbitrary position. Accordingly, as in the prior art, in the terminal section where the upper unit case 3 is closed with respect to the lower unit case 2, the rotational speed of the upper unit case 3 in the closing direction is rapidly increased. It is possible to prevent inconveniences such as the upper unit case 3 colliding to generate a large noise or the user's finger being caught.

  Further, when the user adjusts the magnitude of the pressing force W, there is an effect that the movement of the upper unit case 3 closing and rotating in the direction of the closing position can be loosened.

  In the first embodiment, when the upper unit case 3 is opened, the user applies an upward force to the free end side of the upper unit case 3 or the like. Then, as shown in FIG. 2A, the lower protrusion 25 of the upper guide member 7 pushes the outer peripheral surface of the small diameter roller portion 12c upward. Due to the reaction force, the upper protrusion portion 21 of the lower guide member 6 in the lower unit case 2 hits the outer peripheral surface of the small diameter roller portion 13c. At this time, since the frictional force between the small diameter roller portions 12c (13c) and the ridge portions 25 (21) is small, the first rotating body 12 slides (slids) along the upper guide member 7 without rotating. ), The second rotating body 13 also slides (slids) along the lower guide member 6 without rotating. The open / close coupling body 10 can move so as to approach the hinge portion 4. In this way, there is an effect that the user can reduce the force applied in the opening direction, and the upper unit case 3 can be opened easily.

  In addition, by setting the downward convex curve line of the upper guide member 7 to a predetermined shape, the downward pressing force W by the user can be made constant regardless of the opening angle of the upper unit case 3. .

  In the present invention, in order to open the upper unit case 3 with respect to the lower unit case 2, the user applies an upward force to the free end or the like of the upper unit case 3, so that the opening / closing connector 10 is connected to the lower guide member 6. If it moves so that it may approach the hinge part 4 along the upper guide member 7, and the effect | action of the said upward force is stopped, the opening-closing coupling body 10 will stop in that position, and the opening angle of the upper unit case 3 may be hold | maintained. it can.

  As another means for applying a load N to the open / close coupling body 10, as shown in FIG. 3, a base end of a mainspring spring (spiral spring) is fixed in a cylindrical case 30, and a wire is connected to the free end of the mainspring spring. The base end of the flexible string body 31 such as the above is connected, and a force in the winding direction is applied to the mainspring spring in advance to urge the majority of the string body 31 so as to be wound into the case 23. The case 30 is fixed in the lower unit case 2 on the side close to the hinge portion 4 by using a biasing means, the free end of the string 31 is connected to the frame 11 of the opening / closing connector 10, and the hinge is connected to the opening / closing connector 10. It is set as the structure which gives the load which goes to the part 4 (refer FIG. 1 (A) and FIG. 1 (B)). In addition, a telescopic hydraulic or gas cylinder is fixed in the lower unit case 2, the tip of the piston rod is connected to the frame 11, and an urging force (load) is applied to the open / close connection body 10 toward the hinge portion 4. It is good also as a structure to give.

  As a second embodiment, although not shown, a lower guide member 6 having an upward convex curve is disposed in the lower unit case 2 so as to extend from the hinge portion 4 side to the open end portion side. At the end of closing, the horizontal and linear upper guide member 7 is arranged so as to extend from the hinge part 4 side to the open end part side. In this embodiment, the same effects as those of the first embodiment can be obtained. The linear upper guide member 7 may be disposed so as to be inclined upward or downward toward the open end side.

  In both the first embodiment and the second embodiment, an upper unit with respect to the lower unit case 2 is provided by providing a recess (not shown) at a position separated from the hinge portion 4 on the lower guide surface of the lower guide member 6. At the closed position of the case 3, the second rotating body 13 is fitted into the recess. By this fitting, it is possible to provide a click feeling at the closing completion position of the upper unit case 3 and to completely close the upper unit case 3.

  In addition to the above-described embodiments, the present invention can employ various embodiments without departing from the spirit of the invention. That is, the upper and lower unit cases can be applied not only to the image recording apparatus but also to the main body of a fixture such as an electric product or furniture and its lid.

1 image recording device 2 lower unit case 3 upper unit case 4 hinge portion 6 lower guide member 7 upper guide member 10 opening / closing connector 11 frame 12 first rotating body 13 second rotating bodies 12a, 12b, 13a, 13b, large diameter roller Parts 12c, 13c small diameter roller part 14 support shaft 15 brake member 20, 23 guide groove 21, 24 upper ridge part 22, 25 lower ridge part

Claims (5)

A lower unit case and an upper unit case are mounted so as to be vertically openable and closable via a hinge provided on one side,
The lower unit case includes a lower guide member extending from the hinge side to the open end side,
The upper unit case is provided with an upper guide member so as to extend from the hinge side to the open end side,
One of the lower guide member and the upper guide member is formed in a convex curve shape, and the other is formed in a straight and horizontal shape,
An open / close coupling body movably coupled to the lower guide member and the upper guide member;
In the open / close coupling body, a first rotating body is provided to be movable along the upper guide member, and a second rotating body is provided to be movable along the lower guide member,
The first rotating body and the second rotating body are provided so as to be rotatable coaxially with each other horizontally,
As the operation of opening the upper unit case with respect to the lower unit case, the open / close coupling body sequentially moves from the open end side to the hinge side along the upper and lower members,
As the upper unit case is closed with respect to the lower unit case, the open / close coupling body is configured to sequentially move from the hinge part side to the open end part side along the upper and lower members. An opening and closing device for the upper unit case.   The horizontal component at the position of the first rotating body of the weight of the upper unit case and the resultant force of the pressing force applied to the upper unit case when the open / close coupling body is located at any position of the upper and lower guide members. Is greater than or equal to the sum of the vertical component of the pressing force and the horizontal frictional force due to the weight of the open / close coupling body and the horizontal component of the resistance force acting on the open / close coupling body. 2. The upper unit case opening / closing apparatus according to claim 1, wherein the upper unit case opening / closing posture is maintained when the pressing force is released and the pressing force is released. In the open / close coupling body, a friction member is disposed between the first rotating body and the second rotating body,
As the upper unit case is closed with respect to the lower unit case, the first rotating body abuts on the upper guide surface of the upper guide member and rolls, and the second rotating body is lowered on the lower guide member. By rolling in contact with the side guide surface, the first rotating body and the second rotating body rotate in opposite directions,
3. The upper unit case opening and closing according to claim 1, wherein the first rotating body and the second rotating body are configured to contact each friction member and receive a resistance force. 4. apparatus. The first and second rotating bodies are arranged such that two large-diameter rollers on the same axis are separated from each other with the small-diameter roller interposed therebetween,
The ridges on the lower guide surface of the upper guide member and the ridges on the upper guide surface of the lower guide member are formed so as to face each of the small diameter roller parts,
During the operation of closing the upper unit case with respect to the lower unit case, the two large diameter roller portions of the first rotating body roll while being pressed against the upper guide surface of the upper guide member, and the second rotation The upper unit case opening and closing device according to claim 3, wherein the two large diameter roller portions of the body are configured to roll while being pressed by a lower guide surface of the lower guide member. Each of the small-diameter rollers and the protrusions on the lower guide surface of the upper guide member and the protrusions on the upper guide surface of the lower guide member are members having a small friction coefficient,
During the operation of opening the upper unit case with respect to the lower unit case, the small diameter roller portion of the first rotating body rolls while being slidably contacted with the protruding portion of the lower guide surface of the upper guide member, and 5. The upper unit case according to claim 4, wherein the small-diameter roller portion of the second rotating body is configured to roll while being slidably contacted with a protruding portion provided on an upper guide surface of the lower guide member. Switchgear.

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