JP5377227B2 - Rotating body assist mechanism - Google Patents

Description

  The present invention provides a mechanism that functions to assist (assist) the forward movement of a rotating body that is moved forward toward the forward movement end position from a predetermined forward movement position to the forward movement end position. Regarding improvements.

  There is a door closer that is engaged with a pin provided on the door immediately before the door is closed and is attached to the door frame side by an engaging body that is rotated by a biasing means and assists in closing the door. (Refer to Patent Document 1) On the contrary, a pin is provided on the door frame side to engage with the pin on the door side, and an arm that rotates by the spring force to assist in closing the door is attached to the door side. There is a door body closing device. (See Patent Document 2)

  In this type of mechanism, when the door is closed to a predetermined position, the pin is not properly captured by the engaging body or arm unless the pin is positioned at the engaging portion of the engaging body or arm. The expected operation cannot be realized. However, this pin alignment is performed only by removing the pin from the door or door frame and reattaching it to an appropriate position in the mechanisms shown in Patent Documents 1 and 2.

Japanese Patent Application Laid-Open No. 2007-177459 JP 2007-120140 A

  The main problem to be solved by the present invention is that it is possible to easily and appropriately adjust the position of the striker captured by the receiving member in this type of assist mechanism.

In order to achieve the above object, according to the present invention, an assist mechanism for a rotating body includes a striker provided on one of the rotating body and a support body that rotatably supports the rotating body, and the other of them. An assist mechanism provided with a receiving member that assists the forward movement of the rotating body to the forward movement end position after capturing the striker at a predetermined forward position of the rotating body,
The striker is supported by a support arm, and the support arm is assembled to a base attached to one of the rotating body and the support body so that the position of the striker can be adjusted up and down and left and right via an adjusting means.

  When the rotating body is moved forward to a predetermined forward movement position, the striker is captured by the receiving member, and the movement of the receiving member after the capture assists the forward movement of the door toward the forward movement end position via the striker. However, such forward movement assistance cannot be realized unless the striker and the receiving member are appropriately arranged. If this arrangement is inappropriate, even when the door is moved forward, the striker is not properly captured by the receiving member, and the desired operation of the assist mechanism cannot be realized. According to this configuration, the striker appropriately captures the receiving member by adjusting the assembly position of the support arm with respect to the base by the adjusting means, that is, the position of the striker with a high degree of freedom vertically and horizontally without causing the base to be reattached. Can be done.

  As a preferred embodiment, the adjusting means is configured such that a pair of sandwiching bodies for sandwiching the base from the front and back, a support arm and the base are fastened by a tightening operation, and the pair of sandwiching bodies are used as a base by the tightening operation. It is comprised from the fastening means made to press-contact. In this case, one of the pair of sandwiching bodies is supported so as to be movable in the vertical direction or the left-right direction with respect to the base, and the other of the pair of sandwiching bodies has the one sandwiching body with respect to the one sandwiching body. When supported by the base so as to be movable in the vertical direction, it is supported so as to be movable in the left-right direction. When this one holding body is supported so as to be movable in the horizontal direction, it is supported so as to be movable in the vertical direction. It is preferable to do so.

  By doing so, the position of the support arm, that is, the striker position can be moved up and down and left and right by loosening the tightening by the tightening means, and the support arm can be tightened by tightening the tightening means after this adjustment. The striker can be positioned so as to be properly captured by the receiving member at a predetermined forward movement position of the rotating body.

  If each of the pair of holding members is provided with a spike portion that bites into the base by tightening operation of the tightening means, the fixed state of the support arm with respect to the base is stably maintained, and the striker is stably in a predetermined position. Can be positioned. Further, in this case, when the spike portion is constituted by a circumferential projection formed on the other surface side when the through hole is formed from the one side of the metal clamp body, the protruding tip of the circumferential projection is provided. Since the edge portion positioned at can be formed sharply without special consideration, the spike portion can be firmly bited into the base.

  The tightening means is optimally a bolt that is screwed to a nut portion formed on a holding body located on the rear surface side of the base. If the bolts constituting the tightening means in this case are arranged so that the center line of the bolts intersects the virtual horizontal line passing through the center of the support arm in the vertical direction, a single bolt can be attached to the base. On the other hand, the support arm can be stably fixed as described above. In this case, if the bolt is further screwed from below into a nut portion formed on the holding body located on the rear surface side of the base through a through hole formed on the lower side of the support arm, the bolt is applied from below. The operation of tightening the bolt can be easily performed. For example, when the assist mechanism of the rotating body is provided at the upper part of the door and the door frame, the screw is screwed for adjusting the position of the striker and the adjustment. Facilitates later screwing operations.

  According to this invention, the position adjustment of the striker captured by the receiving member can be performed without causing the removal on the striker side, and such position adjustment can be easily and appropriately performed.

FIG. 1 is a perspective configuration diagram showing a use state of an assist mechanism configured by applying the present invention, and shows an upper side of a door as viewed from below. FIG. 2 is a configuration diagram showing the receiving member as viewed from below so that the operation of the receiving member of the assist mechanism of FIG. 1 can be easily understood, and shows a state in which the receiving member is in the standby position. FIG. 3 is a block diagram showing the receiving member viewed from below so that the operation of the receiving member of the assist mechanism of FIG. 1 can be easily understood. The receiving member captures the striker and moves to the wraparound position. Show. FIG. 4 is a perspective configuration diagram showing separately the striker-side member constituting the assist mechanism and the upper side of the carved door for assembling the assist mechanism. FIG. 5 is a vertical cross-sectional view of the striker side member constituting the assist mechanism. FIG. 6 is an exploded perspective view of the striker side member constituting the assist mechanism. FIG. 7 is an exploded perspective view showing the striker side member constituting the assist mechanism as seen from the opposite direction to FIG. 6. FIG. 8 is a perspective view of the front holding member constituting the striker side member constituting the assist mechanism. 9 is a cross-sectional view taken along the line AA in FIG. FIG. 10 is a perspective view of the rear holding member constituting the striker side member constituting the assist mechanism. 11 is a cross-sectional view taken along the line BB in FIG. FIG. 12 is a front view of the rear clamping body. FIG. 13 is a rear view of the rear clamping body. 14 is a cross-sectional view taken along the line CC in FIG.

  A typical embodiment of the present invention will be described below with reference to FIGS. The assist mechanism of the rotating body M according to this embodiment performs the forward movement between the predetermined forward movement position and the forward movement end position with respect to the rotary body M moved forward toward the forward movement end position. It functions to assist.

  The rotating body M is supported by the support body F so as to be able to rotate forward and backward, and typically includes a door, a hinged door, and the like. As long as it is supported so as to be able to rotate backward, it is not limited thereto. In the illustrated example, an example is shown in which the assist mechanism is provided on the door Ma and the door frame Fa.

  In the illustrated example, the door Ma as the rotating body M is in a closed position (forward movement end position) where the front surface Mb is abutted against the door contact portion Fb of the door frame Fa as the support body F. The inner opening Fc of the door frame Fa is closed. When the door Ma as the rotating body M is moved forward from the open position not closing the opening Fc toward the closed position, the receiving member 1 constituting the assist mechanism in the forward movement process. The striker 4 constituting the assist mechanism comes into contact with the assist mechanism, and the assist mechanism is operated to such a closed position.

  In the illustrated example, the striker 4 is attached to the side of the door Ma as the rotating body M. Accordingly, in the illustrated example, the receiving member 1 is provided on the side of the door frame Fa as the support body F. In addition, even if the striker 4 is attached to the side of the door frame Fa as the support body F and the receiving member 1 is provided on the door Ma side as the rotation body M separately from the example shown in the figure, The movement can be assisted from the middle.

  In the illustrated example, the striker 4 is positioned through the support arm 5 and the base 6 in front of the first surface Mb that becomes the head during the forward movement of the door Ma. More specifically, in the illustrated example, the striker 4 is provided on the upper end side of the door Ma on the door hinge side Mc of the door Ma. The base 6 has attachment portions (both ends of a head 60 described later) for the door Ma as the rotating body M. On the other hand, the support arm 5 supports the striker 4 at the arm tip 5b. The support arm 5 is assembled to the base 6 so that the position of the support arm 5 can be adjusted up and down and left and right via an adjusting means 7 which will be described later. The striker 4 is configured as a shaft-like body protruding upward from the arm tip 5b of the support arm 5. The upper end of the striker 4 is positioned at a level slightly below the upper end surface Me of the door Ma, and the door Ma is closed by the receiving member 1 provided at the upper part of the door frame Fa when the door Ma moves forward toward the closing position. It is to be captured just before it can. The support arm 5 is positioned below a lower level of a main body 2 (described later) in which the receiving member 1 is rotatably accommodated.

  On the other hand, the receiving member 1 is configured to move after capturing the striker 4 at a predetermined forward movement position of the rotating body M to assist the forward movement of the rotating body M to the forward movement end position.

  In the illustrated example, the receiving member 1 is combined with the main body 2 so as to be rotatable between a standby position and a wraparound position. The main body 2 has the top portion 2a as an attachment portion to the upper portion of the door frame Fa, and the receiving member 1 is rotatably supported by the main body 2 with a vertical shaft 2b protruding downward from the top portion 2a of the main body 2. ing. The receiving member 1 has a substantially fan-shaped outline in a bottom view, and has a shaft hole 1a for the vertical shaft 2b in a main part of the fan shape. Further, the receiving member 1 is formed with a catching recess 1c which is opened at the fan-shaped arc-shaped edge 1b and is recessed from the arc-shaped edge 1b toward the shaft hole 1a. In the illustrated example, the entrance 1d of the catching recess 1c of the receiving member 1 is directed toward the approaching side, that is, the front side of the door Ma at the time of forward movement in the standby position (FIG. 2). When the door Ma is moved forward to a predetermined forward movement position in the catching recess 1c of the receiving member 1, the striker 4 enters. (During this forward movement, the inner wall 1e on the front side of the recess inner walls 1e and 1f on the entrance 1d side of the catching recess 1c in the standby position is dislocated to the side of the movement trajectory x of the striker 4, and the inner wall 1f on the rear side When the striker 4 enters the capture recess 1c in this way, the receiving member 1 moves the entrance 1d of the capture recess 1c to the rear side. The forward rotation of the door Ma is applied to the forward rotation by the urging force of the urging means 3 from the middle of the forward rotation. The forward movement is directed to assist. In the illustrated example, the biasing means 3 is fixed to the arcuate edge 1b side of the receiving member 1 with the spring end 3b, and the other end 3c of the spring is fixed to the main body 2, and between the spring ends 3b and 3c. The tension coil spring 3a provided on the main body 2 is configured so that the dimension becomes the largest at an intermediate position between the standby position and the wraparound position of the receiving member 1. The spring 3a can assist the forward movement of the door Ma and maintain the standby member 1 in the standby position and the wraparound position. That is, in the illustrated example, the spring 3a is extended most at the intermediate position where the spring ends 3b and 3c and the vertical shaft 2b are located on substantially the same virtual straight line. When the receiving member 1 that has received the trapping recess 1c is moved from the standby position to a position exceeding the intermediate position by the forward movement of the door Ma, the receiving member 1 is biased from the intermediate position to the wraparound position. To forcibly rotate forward to assist the forward movement of the door Ma. Further, when the receiving member 1 is in the standby position, the forward rotation of the receiving member 1 causes the spring 3a to extend, and when the receiving member 1 is in the wraparound position, the reverse rotation of the receiving member 1 also extends the spring 3a. Therefore, the state in which the receiving member 1 is in the standby position and the state in the wraparound position are each maintained by the spring 3a. If a braking force is applied to the forward rotation of the receiving member 1 using a damper device (not shown) or the like, the forward movement of the assisted door Ma can be made slow. When the door Ma at the forward movement end position is moved backward, the receiving member 1 capturing the striker 4 is reversed to the standby position, and when reaching the standby position, the striker 4 comes out of the capture recess 1c and is released. The door Ma is allowed to return.

  Further, in the assist mechanism according to this embodiment, the striker 4 can be adjusted in the vertical and horizontal positions by the support arm 5 assembled to the base 6 via the adjusting means 7, in the illustrated example. The rotating body M is provided on the door Ma side. That is, in the illustrated example, the position of the striker 4 can be adjusted in the vertical direction and the horizontal direction of the door Ma.

  When the door Ma as the rotating body M is moved forward to a predetermined forward movement position, the striker 4 is captured by the receiving member 1 and is moved to the forward movement end position via the striker 4 by the movement of the receiving member 1 after the capturing. The forward movement of the door Ma is assisted. However, such forward movement assistance cannot be realized unless the striker 4 and the receiving member 1 are appropriately arranged. If this arrangement is inappropriate, the striker 4 is not properly captured by the receiving member 1 even if the door Ma is moved forward, and the desired operation of the assist mechanism cannot be realized. In this embodiment, the adjustment means 7 adjusts the assembly position of the support arm 5 with respect to the base 6, that is, the position of the striker 4 with high flexibility in the vertical and horizontal directions without causing the base 6 to be reattached. The striker 4 can be appropriately captured by the receiving member 1.

  Specifically, the support arm 5 is bent between the arm base 5a and the arm tip 5b, and the arm tip 5b is positioned on the side of the arm base 5a. A seat plate 5c having a square disk shape is formed on the arm base 5a. The support arm 5 is formed so as to protrude forward from the front surface of the seat plate 5c. A recess 5d is formed on the lower side of the arm base 5a, and a fastening described later is provided between the central portion of the seat plate 5c and a wall portion of the recess 5d located on the seat plate 5c side. A through-hole 5e of a bolt 72a serving as the insertion means 72 is formed in a penetrating state. The through hole 5e has a hole on the side of the recess 5d located below the hole on the side of the seat plate 5c, and the bolt 72a inserted into the through hole 5e from the side of the recess 5d is supported by the support arm 5 The center line L2 of the bolt 72a is crossed in the up-down direction with respect to a virtual horizontal line L1 passing through the center. (FIG. 5) The bolt 72a is inserted into a screw hole 71e as a nut portion formed in a rear holding body 71, which will be described later, located on the rear surface side of the base 6 through a through hole 5e formed on the lower side of the support arm 5. The screw 72 can be screwed from below, and the screwing operation of the bolt 72a, that is, the tightening operation or the screwing operation can be easily performed from below.

  The base 6 includes a head 60 that is long in the left-right direction, and a main body 61 that is integrally connected to the head 60 at the upper part between both ends of the head 60. The main body 61 includes a substantially square front surface 61a and a rear surface 61b, and a rectangular window hole 62 penetrating through the front surface 61a and the rear surface 61b.

  Specifically, the front surface 61a and the rear surface 61b of the main body 61 have an upper side, a lower side, and left and right sides, respectively. The front surface 61a and the rear surface 61b of the main body 61 are surrounded by an upper wall 63, a lower wall 64, and left and right side walls 65, 65 formed along these sides, respectively. Further, at both ends of the head 60, screw through holes 60a penetrating the head 60 are formed in the vertical direction. In the illustrated example, the engraving Md formed on the door Ma as the rotating body M is used so that the support arm 5 can be projected forward from the one surface Mb side of the door Ma, and the upper end side of the door Ma A base 6 can be attached. (FIGS. 1 and 4) The engraving Md is opened on the upper end surface Me of the door Ma and the one surface Mb side of the door Ma. In the illustrated example, the lower side of the main body portion 61 of the base 6 is first placed in the engraving Md from above, and the screw S is then screwed to the door Ma side through the through hole 60a. The base 6 is attached to. The front surface 61a of the base 6 faces the open portion of the engraving Md on this side on the one surface Mb side of the door Ma, and the support arm 5 projects forward from there.

  Further, in this embodiment, the adjusting means 7 fastens the pair of sandwiching bodies for sandwiching the base 6 from the front and the back, the support arm 5 and the base 6 by a tightening operation, and by this tightening operation. It is comprised from the fastening means 72 which press-contacts a pair of said clamping body to the base 6. FIG.

  In the illustrated example, one of the pair of sandwiching bodies is on the front surface 61 a side of the main body 61 of the base 6, and is supported so as to be movable in the left-right direction with respect to the base 6. (Hereinafter, this one sandwiching body is referred to as a front sandwiching body 70.) The other of the pair of sandwiching bodies is on the rear surface 61b side of the main portion 61 of the base 6, and is movable in the vertical direction with respect to the front sandwiching body 70. It is supported by. (Hereinafter, this other clamping body is referred to as a rear clamping body 71.)

  Specifically, the front clamping body 70 is made of metal and is configured to have a substantially square plate shape. The front clamping body 70 has a vertical dimension substantially equal to the distance between the upper wall 63 and the lower wall 64 on the front surface 61a side of the main body 61 of the base 6, and has a horizontal dimension on the left and right sides on the front surface 61a side. It is smaller than the interval between the side walls 65 and 65. The front holding member 70 is combined with the base 6 so that the upper side of the front holding member 70 is guided by the upper wall 63 and the lower side thereof is guided by the lower wall 64 so as to be movable in the left-right direction. A guide window hole 70 a communicating with the window hole 62 of the base 6 is formed at the center of the front holding body 70. The guide window hole 70a has a rectangular shape with the vertical direction as the length side. Further, the left side and the right side of the front holding body 70 are respectively formed with protruding portions 70b protruding forward. The protruding portion 70b is formed by bending a metal plate that constitutes the front clamping body 70. In addition, spike portions 70c that bite into the front surface 61a of the main body portion 61 constituting the base 6 by the tightening operation of the tightening means 72 are formed on both the left and right sides of the front sandwiching body 70 across the guide window hole 70a. . In the illustrated example, four spike portions 70c are vertically arranged on both the left and right sides of the guide window hole 70a with an interval between adjacent spike portions 70c. Each of the spike portions 70c is constituted by a circular protrusion 70e around the hole edge of the through hole 70d formed on the rear surface side when the front holding body 70 is formed with the through hole 70d from the front surface side. (Fig. 9)

  On the other hand, the rear clamping body 71 is also made of metal. The rear sandwiching body 71 includes a substantially rectangular frame portion 71a having an upper side, a lower side, and left and right sides, a bridge portion 71b extending between the upper center and the lower center of the frame portion 71a, and the bridge portion. A pair of left and right arm portions 71c and 71c projecting forward from a position approximately midway in the vertical direction of 71b is provided. The frame portion 71a of the rear clamping body 71 has a vertical dimension smaller than the interval between the upper wall 63 and the lower wall 64 on the rear surface 61b side of the main body 61 of the base 6, and has a horizontal dimension. The distance between the left and right side walls 65, 65 on the rear surface 61b side is made smaller. Each of the pair of arm portions 71c and 71c is configured to have a plate shape in which the tip of the arm is positioned forward from the front surface of the frame portion 71a and the plate surface is along the vertical direction. The vertical dimension of the pair of arm parts 71c, 71c is smaller than the vertical dimension of the guide window hole 70a of the front clamping body 70, and the distance between the outer surfaces of the pair of arm parts 71c, 71c is the front clamping body 70. The guide window hole 70a is substantially equal to the horizontal dimension. Then, the rear holding body 71 has a pair of arm portions 71c in the guide window hole 70a of the front holding body 70 through the window hole 62 of the base 6 in a state where the frame portion 71a is attached to the rear surface 61b of the base 6. The front end of the arm 71c is inserted and guided to the guide window hole 70a so as to be movable in the vertical direction and combined with the front holding body 70. In the illustrated example, the connecting portion of the rear sandwiching body 71 with the bridging portion 71b and the bridging portion 71b in the frame portion 71a is configured by bending a metal plate so that a recess 71d is formed forward, These portions protrude rearward from the rear surface 61b of the frame portion 71a. A threaded hole 71e as a nut portion for receiving the bolt 72a serving as the tightening means 72 is formed obliquely from below at a position where the frame portion 71a is connected to the bridging portion 71b on the upper side. Further, the main part 61 constituting the base 6 by the tightening operation of the tightening means 72 on the left and right sides sandwiching the bridging part 71b on the upper side and the lower side of the frame part 71a of the rear holding body 71, respectively. A spike portion 71f that bites into the rear surface 61b is formed. In the illustrated example, two spike portions 71f are arranged on the left and right sides of the bridging portion 71b with a gap between adjacent spike portions 71f. Each of the spike portions 71f is formed by a circular protrusion 71h around the hole edge of the through hole 71g formed on the rear surface side when the through hole 71g is formed on the frame portion 71a of the rear holding body 71 from the front surface side. It is configured. (Fig. 11)

  The distance between the left and right protruding portions 70b of the front holding member 70 is substantially equal to the left and right dimensions of the seat plate 5c of the support arm 5, and the support arm 5 is in a state where the seat plate 5c is in close contact with the front surface 61a of the front holding member 70. The left and right protruding portions 70b of the front clamping body 70 are accommodated. The vertical dimension of the seat plate 5 c of the support arm 5 is smaller than the distance between the upper wall 63 and the lower wall 64 of the front surface 61 a of the main body 61 of the base 6. The bolt 72 a as the tightening means 72 passes through the guide window hole 70 a of the front holding body 70 and the window hole 62 of the base 6 through the through hole 5 e of the support arm 5 and is screwed to the screw hole 71 e of the rear holding body 71. It is possible. When the bolt 72a is screwed, that is, tightened, the seat plate 5c of the support arm 5 is pressed against the front surface of the front holding member 70, and the rear surface of the front holding member 70 and the front surface of the frame portion 71a of the rear holding member 71. The main body 61 of the base 6 is sandwiched between the support arm 5 and the support arm 5 is fixed to the base 6 so that the striker 4 is positioned at a predetermined position.

  The pair of sandwiching bodies, that is, the front-side sandwiching body 70 and the rear-side sandwiching body 71 are each provided with spike portions 70 c and 71 f that bite into the base 6 by the tightening operation of the tightening means 72. The fixed state of the arm 5 is stably maintained, and the striker 4 can be stably positioned at a predetermined position. Typically, the base 6 is made of synthetic resin, and the pair of sandwiching bodies is made of a material having higher hardness than the base 6.

  Such spike portions 70c and 71f are formed on the metal holding body from the one surface side as described above, and the circumferential protrusions formed on the other surface side when the through holes 70d and 71g are formed typically by punching. When configured by 70e and 71h, the edge located at the protruding tip of the circular protrusions 70e and 71h can be formed sharply without special considerations. Therefore, spike portions 70c and 71f are formed on the base 6. It is possible to make a strong bite.

  Further, in this embodiment, the bolt 72a constituting the tightening means 72 crosses the center line L2 of the bolt 72a in the vertical direction with respect to the virtual horizontal line L1 passing through the center of the support arm 5. Thus, the support arm 5 can be stably fixed to the base 6 as described above with the single bolt 72a.

  Further, as described above, one of the pair of sandwiching bodies, in the illustrated example, the front sandwiching body 70 is supported by the base 6 so as to be movable in the left-right direction, and the other of the pair of sandwiching bodies, in the illustrated example, the rear sandwiching body 71. Is supported by the front clamping body 70 so as to be movable in the vertical direction, the position of the support arm 5, that is, the position of the striker 4 can be moved up, down, left and right by loosening the bolt 72 a constituting the fastening means. After the adjustment, the support arm 5 can be fixed to the base 6 by tightening the bolt 72a, and the striker 4 can be positioned so as to be properly captured by the receiving member at a predetermined forward movement position of the rotating body M.

Ma door Fa door frame 2 receiving member 4 striker 5 support arm 6 base 7 adjusting means

Claims (5)

A striker provided on one of the rotating body and a support body that rotatably supports the rotating body, and a striker provided on the other of the rotating body and moving after capturing the striker at a predetermined forward movement position of the rotating body. An assist mechanism including a receiving member for assisting the forward movement of the rotating body to the forward movement end position,
The striker is supported by a support arm, and the support arm is assembled to a base attached to one of the rotating body and the support body so that the vertical and left and right positions can be adjusted via an adjusting means .
The adjusting means includes a pair of sandwiching bodies for sandwiching the base from the front and back, and a fastening means for fastening the support arm and the base by a tightening operation and pressing the pair of sandwiching bodies to the base by the tightening operation. Configured,
Each of the pair of sandwiching bodies includes a spike portion that bites into the base by a tightening operation of the tightening means,
In addition, when forming the through-hole from the one surface side of the metal clamping body, a circular protrusion around the hole edge of the through-hole is formed on the other surface side, and the circular protrusion is used as the spike portion. times characterized by comprising Te elements of assist mechanism.   One of the pair of sandwiching bodies is supported so as to be movable in the vertical direction or the left-right direction with respect to the base, and the other of the pair of sandwiching bodies moves in the vertical direction with respect to the one sandwiching body. It is supported so that it can move in the left-right direction when it is supported, and when it is supported so that it can move in the left-right direction on the base, it is supported so that it can move in the up-down direction. The assist mechanism for a rotating body according to claim 1.   The assisting mechanism for a rotating body according to claim 1 or 2, wherein the tightening means is a bolt that is screwed to a nut portion formed on a holding body located on the rear surface side of the base.   4. The assist mechanism for a rotating body according to claim 3, wherein the bolt is arranged so as to cross the center line of the bolt in the vertical direction with respect to a virtual horizontal line passing through the center of the support arm.   5. The bolt is configured to be screwed from below into a nut portion formed on a holding body positioned on the rear surface side of the base through a through hole formed on the lower side of the support arm. An assist mechanism for a rotating body as described in 1.

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