JP6639440B2 - Screw back plate and its mounting method - Google Patents

Description

  The present invention relates to a screw back plate for reinforcing a mounting bracket for retrofitting a window frame component to an existing hollow window frame, and a method of mounting the same.

  As a conventional technique, a screw back plate for reinforcing a mounting bracket for attaching a window frame component to a window frame afterwards, wherein the screw back plate is inserted into a screw back plate insertion hole formed in the window frame. The screw back plate has a configuration in which the screw back plate is screwed with a back plate fixing bolt through a screw insertion hole of the window frame (see Patent Document 1).

JP 2011-214218 A

  However, the conventional screw back plate has one end portion of the screw back plate for holding the screw back plate inserted from the screw back plate insertion hole into the inner surface of the window frame from the outer surface of the window frame. The holding bolt is screwed into the holding bolt screw hole.

  According to such a configuration, the screw back plate has a screw hole for fixing the screw back plate and the window frame part, and the holding bolt used only when the screw back plate is attached. In order to secure an extra screw hole, it is necessary to form the window frame component larger than necessary to reinforce the mounting strength of the window frame component.

  With this configuration, the holding bolt screwed to the screw back plate is gripped and inserted into the inner surface of the window frame from the screw back plate insertion hole, and the screw back plate is aligned with the inner surface of the window frame. Then, after the screw back plate is screwed with the back plate fixing bolt through the screw insertion hole of the window frame, in a state where the holding bolt is removed, the one end portion including at least the holding bolt screw hole is the one end portion. It will protrude to the inner surface side of the screw back plate insertion hole. Therefore, even if you try to insert another screw back plate into the inner surface of the window frame using the same screw back plate insertion hole, the one end protruding from the screw back plate insertion hole becomes a hindrance, It was necessary to provide another screw insertion hole in the window frame.

  On the other hand, in order to use the same screw back plate insertion hole avoiding the one end protruding from the screw back plate insertion hole, the screw back plate insertion hole must be enlarged in the direction in which another screw back plate is attached. I had to keep it. However, when such a large screw back plate insertion hole is formed, in the process of attaching the screw back plate, if the hand is accidentally released from the holding bolt, the screw together with the holding bolt is inserted into the cylindrical wall of the window frame. There was a risk that the back plate dropped and could not be taken out.

  Therefore, as a means for solving the above-mentioned problems, the screw back plate and the method of mounting the same according to the present invention include: [1] In order to reinforce the mounting strength of a window frame component to be retrofitted on the outer surface of a hollow window frame A screw back plate attached to the inner surface of the window frame, wherein a pair of back plate portions has, at each side edge, a side edge of a grip plate portion wider than the back plate portion, A plurality of screw holes are connected to each other on the axis intersecting the side edge provided with each connecting portion on the back plate portion by connecting through a connecting portion narrower than the back plate portion. A screw back plate, which is provided at a distance.

  It is preferable that the side edges of the back plate portion and the grip plate portion are outer peripheral end surfaces of the back plate portion and the grip plate portion formed in a thin plate shape. Further, it is preferable that the term "on an axis intersecting with the side edge" be on an axis passing through the center of the width of the back plate portion and orthogonal to the side edge.

  The present invention also provides [2] the screw back plate according to [1], wherein the pair of back plate portions and the grip plate portion are connected in a rod shape.

  It is preferable that the rod shape is such that the back plate portion, the gripping plate portion, and the connecting portion are formed linearly on the axis, and the pair of back plate portions is positioned with respect to the axis. It is also preferable that they are formed in parallel and substantially in a crank shape.

  [3] The invention according to [1] or [2], wherein the back plate portion is connected to the holding plate portion in a bent state at the connection portion. It is a screw back plate of description.

  The bent state is preferably a state in which the wide surface of the back plate portion is obliquely bent in a direction in which the wide surface of the back plate portion faces the wide surface of the grip plate portion in the connection portion.

  [4] In the present invention, [4] the gripping plate portion is provided with at least three positioning holes formed in a line at the same interval as the center interval of the screw holes. ] It is a screw back plate in any one of [3].

  The present invention also provides [5] the outer surface of the window frame, which is wider than the back plate portion of the screw back plate according to any one of [1] to [4] and is larger than the grip plate portion. An insertion step of piercing a back plate part insertion hole having a narrow inner diameter, inserting one back plate part formed in the screw back plate into the back plate part insertion hole, and penetrating the outer surface of the window frame. A fixing step of screwing the fixing screw into the screw hole to fix the one back plate portion, and a detachment step of disconnecting the connection between the one back plate portion and the grip plate portion in the connection portion, Performing the insertion step, the fixing step, and the removal step also for the other back plate part, to fix a set of back plate parts to the inner surface of the window frame, How to attach.

  [6] The present invention also provides [6] three or more of the screw back plate described in [4], which are pressed at equal intervals along the center of the positioning hole by pressing the holding plate portion of the screw back plate against the outer surface of the window frame. At the position of one of the perforated marks excluding both ends of the perforated mark, the outer perimeter of the window frame is wider than the back plate portion and wider than the grip plate portion. While drilling a back plate part insertion hole having a narrow inner diameter, a screw penetration hole is drilled at the position of another drill mark, and one back plate part formed on the screw back plate is inserted into the back plate part insertion hole. An insertion step of inserting the screw hole into the inner surface of the window frame and abutting the screw hole and the screw penetration hole at the same position, and the screw penetration hole from the outside of the window frame. A fixing step of screwing a fixing screw penetrating into the screw hole to fix the one back plate portion; and Performing a detachment step of disconnecting the connection between the one back plate portion and the gripping plate portion, and performing the insertion step, the fixing step, and the detachment step also on the other back plate portion, thereby forming the window frame. A method of attaching a screw back plate, comprising fixing a set of back plate portions to an inner surface.

  The screw back plate of the present invention is for reinforcing the mounting strength of the mounting bracket for fixing the window frame component to the window frame, and the back plate portion insertion hole is formed to have an inner diameter that cannot insert the grip plate portion. Thereby, the screw back plate does not drop into the inner surface of the window frame, and is easy to handle.

  In addition, the method of mounting the screw back plate of the present invention can easily mount the mounting bracket of a window frame component used for additional construction of a smoke exhaust device, a window opening / closing device, and the like by retrofitting an existing window frame such as a high window. It is for doing.

  According to the present invention, since the width of the back plate portion is smaller than the inner diameter of the back plate portion insertion hole, the back plate portion can be easily inserted into the back plate portion insertion hole easily. .

  Further, by being configured such that the back plate portion is connected to the holding plate portion in a bent state at the connection portion, the back plate portion is inserted from the back plate portion insertion hole of the window frame toward the inner surface. Since the back plate can be inserted so as to go around, the back plate can be easily made to follow the inner surface of the back plate insertion hole.

  In addition, since the connecting portion is narrowly connected, the back plate portion can be easily bent with respect to the grip plate portion.

  Further, since the three positioning holes are provided in the gripping plate portion, the gripping plate portion can be used as a drilling jig when drilling the back plate portion insertion hole and the plurality of screw penetration holes in the window frame. .

  The method of use as the drilling jig is that the gripping plate portion is pressed against the window frame, and a perforation mark is added by scribing three drilling positions on the window frame using the drilling jig. The screw penetration hole can be formed on the back plate portion insertion hole and on both sides of the back plate portion insertion hole. Further, when the number of screw penetration holes is increased, the positioning holes are shifted by one with respect to the drilling positions, and the perforation marks of the additional drilling positions are scored, whereby a plurality of screw penetration holes are arranged in a line. be able to.

  Further, in a state in which one side of the back plate portion is fixed, the holding plate portion is gripped, and the connecting portion is subjected to fatigue fracture by repeatedly bending, so that the fixed back plate portion is fixed from one side. The other side of the grip plate portion and the back plate portion can be easily separated.

  In this way, only a pair of the back plate portions constituting the screw back plate are attached to the window frame. Further, when the mounting bracket for the window frame component is mounted on the pair of back plate portions, the mounting hole covers the back plate portion insertion hole formed in the window frame.

  According to the screw back plate according to the present invention, even when the screw back plate is accidentally separated from the hand during the mounting operation of the window frame part, the inner diameter of the grip plate portion is smaller than that of the grip plate portion. The screw back plate is locked at the edge of the back plate portion insertion hole, so that the screw back plate does not fall into the inner surface of the window frame.

  According to the screw back plate mounting method of the present invention, when the window frame component is mounted, the back plate portion insertion hole can be covered with the mounting bracket of the window frame component. It is hidden behind the fittings for mounting the window frame parts and does not impair the beauty of the window frame even after the work of mounting the window frame parts.

  Also, since the back plate portion is connected to the grip plate portion in a bent state, the back plate portion wraps around the inner surface from the back plate portion insertion hole of the window frame by gripping the grip plate portion. Can be easily brought into contact with the inner surface of the window frame where the screw holes of the back plate are formed, and the screw back plate can be easily attached to the window frame.

  In addition, the plurality of positioning holes provided in the gripping plate portion of the screw back plate can be used as a jig for drilling a back plate portion insertion hole and a plurality of screw penetration holes in the window frame, It is not necessary to separately prepare a dedicated drilling jig, and mounting work at a high place is facilitated.

  Further, since the connecting portion becomes narrower, after one side of the back plate portion is fixed, the gripping plate portion is gripped, and the bending portion is repeatedly bent so that the connecting portion can be easily fatigue-ruptured.

It is a figure showing an example of the present invention, and is a front view (a), right side view (b), and perspective view (c) of screw back plate 1. It is a figure showing an example of the present invention, and is a front view (a), a right side view (b), and a perspective view of a screw back plate 1 in which a back plate portion 3 is bent at a connecting portion 7 with respect to a grip plate portion 5. It is a figure (c). It is a figure which shows the Example of this invention, and is a perspective view in the state which the back plate part insertion hole H1, screw penetration holes H2, H2, and screw penetration holes H3, H3 were perforated in the window frame W. FIG. 4 is a view showing an embodiment of the present invention, in which the back plate portion 31 on one side of the back plate portion 3 of the screw back plate 1 is brought into contact with the inner surface of the window frame W, and the fixing screw B1 is screwed. It is a perspective view of a state. FIG. 7 is a reference diagram illustrating an embodiment of the present invention and sequentially explaining a method of attaching a back plate portion 31 on one side of the back plate portion 3 of the screw back plate 1 and a back plate portion 33 on the other side to the window frame W. FIG. 9 is a reference end view of a state in which one back plate portion 31 is inserted into a back plate portion insertion hole H1 formed in the window frame W. It is a figure which shows the Example of this invention, and is the reference | standard end view in the state where the back plate part 31 of one side was made to follow the inner surface of the window frame W at the next stage of FIG. FIG. 7 is a view showing the embodiment of the present invention, and is a reference end view in a state in which the back plate portion 31 on one side is screwed and fixed to the window frame W with a fixing screw B1 at the next stage of FIG. 6. FIG. 8 is a view showing an embodiment of the present invention, and is a reference end view in a state where the gripping plate section 5 is to be detached from the fixed back plate section 31 on the next side of FIG. 7. FIG. 9 is a view showing the embodiment of the present invention, and is a reference end view in a state where the back plate 33 on the other side is arranged along the inner surface of the window frame W at the next stage of FIG. 8. FIG. 10 is a view showing an embodiment of the present invention, in a state next to FIG. 9, in which the gripping plate part 5 is to be detached from the other back plate part 33 screwed and fixed with the fixing screw B1. It is a reference end view. It is a figure which shows the Example of this invention, Comprising: It is a reference end view in the state where the back plate part 31 of the one side of the back plate part 3 and the back plate part 33 of the other side were attached to the inner surface of the window frame W. . FIG. 5 is a view showing an embodiment of the present invention, in which fixing screws B2 and B2 are attached to a screw hole 35 of one back plate portion 31 and a back surface of the other side in order to mount a mounting bracket P for a window frame component to a window frame W; FIG. 7 is a perspective view of a state in which the screw is to be screwed into and fixed to a screw hole of a plate portion. FIG. 5 is a view showing an embodiment of the present invention, in which a mounting bracket P is attached to the window frame W using the back plate 3 of the screw back plate 1, and a window frame component is mounted on the mounting bracket P; 1 is a perspective view of a smoke exhaust window opening and closing device S. FIG.

  An embodiment of a screw back plate and a method of attaching the screw back plate according to the present invention will be described in detail with reference to FIGS.

  The screw back plate 1 of one embodiment of the present invention is made of a metal plate made of iron or stainless steel, and as shown in FIGS. 1 and 2, each side edge of a pair of back plate portions 3, The side edge of the gripping plate portion 5 wider than the back plate portion 3 is connected by a connecting portion 7 narrower than the back plate portion 3.

  As shown in FIG. 1 (a), the back plate portion 3 has a rectangular band shape in a front view, and is connected to the grip plate portion 5 and the connecting portion 7 in the longitudinal direction. The shape is smaller than the width of the plate portion 5 and smaller than the inner diameter of the back plate portion insertion hole H1 described below.

  As shown in FIG. 1 (a), the gripping plate 5 has a substantially horizontal hexagonal shape in a front view, and has a strip-like shape extending in a reverse taper from the connecting portion 7, and is connected to the back plate 3 and the connecting portion 7 in the longitudinal direction. The width in the short direction is larger than the width of the back plate portion 3 and is larger than the inner diameter of the back plate portion insertion hole H1 described below.

  As shown in FIG. 8, the holding plate portion 5 spreads in a reverse taper from the connecting portion 7, so that a space for repeatedly bending in the direction of the arrow can be secured with the back plate portion 31 on one side fixed. .

  On an axis perpendicular to the side edge of the back plate portion 3, screw holes 35 and 36 are provided in the back plate portion 31 on one side of the back plate portion 3 so as to be separated from each other, and on the back plate portion 33 on the other side. The screw holes 37 and 38 are provided apart from each other so as to have the same interval as the center interval between the screw holes 35 and 36.

  Further, the screw back plate 1 is configured such that one back plate portion 31, the connection portion 7, the grip plate portion 5, the connection portion 7, and the other back plate portion 33 are adjacent side edges. It is formed in the shape of an integral rod connected linearly on an axis perpendicular to the axis. Since the screw back plate 1 is formed integrally, the screw back plate 1 can be manufactured quickly and at low cost by performing a single punching process from a metal plate.

  Further, as shown in FIG. 2B, the screw back plate 1 has a back plate portion 31, 33 on one side and a back portion with respect to the grip plate portion 5 at a connection portion 7 with the grip plate portion 5 as shown in FIG. The plate portions 3 are connected in a state where they are bent obliquely in the same direction on the axis. Note that the back plate 33 on the other side may be bent obliquely in the opposite direction. In this case, after attaching the back plate portion 31 on one side and causing the connecting portion 7 to undergo fatigue fracture, the back plate portion 33 on the other side is inserted into the back plate portion insertion hole H1 described below without holding the grip plate portion 5. You can enter.

  Further, the screw back plate 1 is provided with three positioning holes 51, 53, 55 formed in a row at the same interval as the center interval of the screw holes 35, 36 in the gripping plate portion 5. By pressing the gripping plate portion 5 against the outer surface of the window frame W and scribing marks at the center positions of the positioning holes 51, 53, 55, it can be used as a drilling jig. The following back plate portion insertion holes H1, screw penetration holes H2, H2, and screw penetration holes H3, H3 can be drilled in accordance with the positions of the perforated marks marked on the crease. Since three positioning holes 51, 53, and 55 are provided, two or more perforation marks are scribed, and then the gripping plate portion 5 is shifted in accordance with the perforation marks. , A large number of equally spaced perforations can be added in a straight line. In the present embodiment, five perforation marks are added to the outer surface of the window frame W using the positioning holes 51, 53, and 55, and the back plate portion insertion holes H1, the screw penetration holes H2, H2, and Preparation was made for drilling the screw penetration holes H3 and H3.

  Next, among the above-mentioned perforated marks added by scribing on the outer surface of the hollow window frame W made of an aluminum alloy, the cutting edge of the drill is applied to one of the perforated marks added at the center, and the back plate portion insertion hole H1 is inserted. Was formed by perforation. Further, countersunk holes H2 and H2 formed with countersinks were punched on both sides of the back plate portion insertion hole H1, and screw holes H3 and H3 which were not countersunk were punched at the punching marks at both ends. The center distance between the screw hole H2 and the screw hole H3 formed next to the screw hole H2 is formed to be the same as the center distance between the screw holes 35 and 36.

  The inner diameter of the perforated back plate portion insertion hole H1 is formed to be larger than the width of the back plate portions 31 and 33 on one side and the other side and smaller than the width of the gripping plate portion 5, and the screw penetration hole H2 is formed. , H2 and the screw penetration holes H3, H3 have the same inner diameter, and are formed so that the fixing screws B1, B2 can penetrate.

  By setting the inner diameter of the back plate portion insertion hole H1 as described above, even if the screw back plate 1 is accidentally separated from the hand during the mounting operation of the window frame part, the screw back plate 1 is kept on the back plate. Since the screw back plate 1 is locked at the edge of the section insertion hole H1, the screw back plate 1 does not fall into the inner surface of the window frame W and cannot be taken out.

  As shown in FIG. 4, the mounting method of the screw back plate 1 according to one embodiment of the present invention is as follows. The back plate portion 31 on one side of the screw back plate 1 is inserted around the inner surface of the window frame W into the back plate portion insertion hole H1 of W.

  Next, with the connecting portion 7 inserted into the back plate portion insertion hole H1 of the window frame W, the one back plate portion 31 is moved along the inner surface of the window frame W while the back plate portion 31 on one side is moved along the inner surface of the window frame W. The position of the screw hole 35 of the window frame W and the position of the screw penetration hole H2 of the window frame W are aligned, and the back plate 31 on one side of the back plate 3 is brought into contact with the inner surface of the window frame W.

  Next, the fixing screw B1 that penetrates the screw penetration hole H2 from the outside of the window frame W is screwed into the screw hole 35, so that the back plate portion 31 on one side is fixed to the window frame W. . Since the screw back plate 1 is bent as described above, the back plate portion 3 can be easily inserted into the back plate portion insertion hole H1, and the back plate portion 3 can be easily aligned along the inner surface of the window frame W. Handling during installation work is simplified.

  After a back plate portion insertion hole H1, screw penetration holes H2, H2, and screw penetration holes H3, H3 are formed in the window frame W, the back plate portion 31 on one side of the screw back plate 1 and the back plate on the other side. The method of attaching the part 33 will be described in order with reference to the steps shown in FIGS. First, as shown in FIG. 5, one back plate 31 is inserted into the back plate insertion hole H1 formed in the window frame W.

  Next, as shown in FIG. 6, the screw hole 35 and the screw penetration hole H2 are aligned with each other, and the other screw hole 36 and the screw penetration hole H3 are aligned with each other. The back plate part 31 is made to follow.

  Next, as shown in FIG. 7, the back plate 31 on one side is brought into contact with the inner surface of the window frame W, and a fixing screw B1 formed by penetrating the screw penetration hole H2 from the outside of the window frame W is inserted into the screw hole. Then, the back plate 31 on one side is fixed to the inner surface of the window frame W.

  Next, as shown in FIG. 8, in a state where the back plate 31 on one side is fixed, the gripping plate 5 is gripped and repeatedly bent in the direction of the arrow to cause the connecting portion 7 to be fatigue-ruptured. Then, the gripping plate portion 5 is separated from the fixed back plate portion 31 on one side and separated.

  Next, as shown in FIG. 9, the back plate part 33 on the other side from which the back plate part 31 on one side has been removed is inserted into the back plate part insertion hole H1 formed in the window frame W, and the screw hole 37 is formed. The position of the screw penetration hole H2 is adjusted, and the position of the other screw hole 38 is aligned with the position of the screw penetration hole H3.

  Next, as shown in FIG. 10, the back plate 33 on the other side is brought into contact with the inner surface of the window frame W, and the fixing screw B1 formed by penetrating the screw penetration hole H2 from the outside of the window frame W into the screw hole. In the state where the back plate 33 on the other side is fixed to the inner surface of the window frame W, the holding plate 5 is gripped and repeatedly bent in the direction of the arrow to cause the connecting portion 7 to be fatigue-ruptured. As a result, the gripping plate portion 5 is separated from the fixed back plate portion 33 on the other side and separated.

  As shown in FIG. 11, the back plate 31 on one side and the back plate 33 on the other side are fixed to the inner surface of the window frame W by fixing screws B1 and B1 by the above-described steps. Further, the countersinking is performed on the screw penetration hole H2, so that the head of the fixing screw B1 does not protrude from the outer surface of the window frame W, and the back plate portion 31 on one side and the back plate portion 33 on the other side. Can be attached.

  After attaching the back plate part 3 of the screw back plate 1 to the inner surface of the window frame W, the method of attaching the window frame component mounting bracket P for opening and closing the smoke exhaust window opening / closing device S to the window frame W is shown in FIG. This will be described with reference to FIGS.

  As shown in FIG. 12, the screw holes 36 of the back plate 31 on one side and the screw holes 38 of the back plate 33 on the other side attached to the inner surface of the window frame W The mounting bracket P can be fixed to the window frame W by screwing with the fixing screws B2 and B2 through the mounting hole O and the screw penetration hole H3 of the window frame W. At this time, since the head of the fixing screw B1 does not protrude from the outer surface of the window frame W, it can be fixed so that the outer surface of the window frame W and the bottom surface of the mounting bracket P are in close contact with each other.

  By fixing the mounting bracket P to the window frame W in this manner, the back plate insertion hole H1 of the window frame W is covered with the mounting bracket P. Is hidden by the mounting bracket P.

  Further, since the back plate 3 made of iron or stainless steel is attached to the window frame W made of aluminum alloy, even if the fixing screws B2 and B2 are screwed tightly into the screw holes 36 and the screw holes 38, iron or stainless steel is used. Therefore, the mounting strength of the mounting bracket P for the window frame component can be reinforced without the screw threads of the screw holes 36 and the screw holes 38 being crushed.

  As shown in FIG. 13, by attaching the mounting bracket P to the window frame W using the back plate portion 3, it is possible to mount the window frame component of the smoke opening and closing device S to the mounting bracket P.

  More specifically, a smoke exhaust window opening / closing device S is provided by retrofitting an existing high window window frame W, and a mounting bracket P is attached to the window frame W using the back plate portion 3, and The sliding arm A is attached to the mounting bracket P, and one end of the string R is fixed to the mounting bracket P of the smoke exhaust window opening and closing device S. The string R is bridged over the pulleys K1 and K2, and the other end of the string R is It is fixed to the handle G. By pulling or returning the handle G, the sliding arm A acts to open and close the high window from a low place.

REFERENCE SIGNS LIST 1 screw back plate 3 back plate portion 5 grip plate portion 7 connecting portion 31 back plate portion on one side 33 back plate portion on the other side 35 screw hole 36 screw hole 37 screw hole 38 screw hole 51 positioning hole 53 positioning hole 55 positioning hole H1 Back plate insertion hole H2 Screw penetration hole H3 Screw penetration hole O Mounting hole P Mounting bracket S Smoke exhaust window opening / closing device W Window frame

Claims (6)

A screw back plate attached to the inner surface of the window frame, in order to reinforce the mounting strength of a window frame component attached to the outer surface of the hollow window frame,
A pair of back plate portions is connected at each side edge to a side edge of the grip plate portion wider than the back plate portion via a connection portion narrower than the back plate portion. Become
On the back plate portion, a plurality of screw holes are provided apart from each other on an axis crossing a side edge provided with each connecting portion,
Screw back plate characterized by the above. The set of back plate portion and the grip plate portion are connected in a rod shape,
The screw back plate according to claim 1, wherein: The back plate portion is connected to the grip portion in a bent state at the connection portion,
The screw back plate according to claim 1 or 2, wherein: The gripping plate portion is provided with at least three positioning holes formed in a line at the same interval as the center interval of the screw holes,
The screw back plate according to any one of claims 1 to 3, wherein: A back plate portion insertion hole, which is wider than the back plate portion of the screw back plate according to any one of claims 1 to 4 and has an inner diameter smaller than the grip plate portion, on an outer surface of the window frame. Pierce the
An insertion step of inserting one back plate portion formed on the screw back plate into the back plate portion insertion hole,
A fixing step of screwing a fixing screw penetrating the outer surface of the window frame into the screw hole, and fixing the one back plate portion,
Performing a detachment step of disconnecting the connection between the one back plate portion and the grip plate portion in the connection portion,
By performing the insertion step, the fixing step, and the removal step also for the other back plate part, a set of back plate parts is fixed to the inner surface of the window frame,
A method of mounting a screw back plate, characterized by that: Pressing the gripping plate portion of the screw back plate according to claim 4 against the outer surface of the window frame, and adding three or more perforation marks spaced at equal intervals in accordance with the center of the positioning hole,
On the outer surface of the window frame, at the position of one of the perforated marks, excluding both ends, of the perforated marks, a back plate having an inner diameter that is wider than the back plate portion and narrower than the grip plate portion. While drilling the part insertion hole, drilling a screw penetration hole at the position of the other drill mark,
One of the back plate portions formed in the screw back plate is inserted into the back plate portion insertion hole, and the surface on which the screw hole is formed on the inner surface of the window frame is formed with the screw hole and the screw penetration hole. An insertion step of aligning and abutting,
A fixing step of screwing a fixing screw penetrating the screw penetration hole from the outside of the window frame into the screw hole, and fixing the one back plate portion,
Performing a detachment step of disconnecting the connection between the one back plate portion and the grip plate portion in the connection portion,
By performing the insertion step, the fixing step, and the removal step also for the other back plate part, a set of back plate parts is fixed to the inner surface of the window frame,
A method of mounting a screw back plate, characterized by that:

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