KR20150054101A - A door intercepting unit - Google Patents

Abstract

The present invention relates to a door blocking device formed of tempered glass and wood. An existing door blocking device includes a blocking member vertically moved by a pressure delivering means moved forward and backward by a magnetic force or a pressing device. A blocking means includes a diamond-shaped groove and a cylindrical groove continuously formed and joined to each other. The existing door blocking device has a problem unable to block gaps on the top surface and the lateral surface by blocking the lower part of a door, especially a problem of weakening a repulsive force of the blocking means composed of a diamond-shaped working piece and upper and lower springs as the center of the working piece is moved downward by an inclined surface of an upper panel from the center of the pressure delivering means when the pressure delivering mean is operated, and a problem of generating unpleasant noise due to movement friction with a door frame when a latch is moved downward in case of the pressing device. Therefore, the present invention provides the door blocking device capable of blocking gaps when the door is closed by blocking not only a gap between the door frame and the lower part of a door but also gaps between the upper and lateral parts and the door frame by improving the existing door blocking device, reducing manufacturing costs by reducing the number of components of the blocking means blocking the lower part and simplifying the shape of the components thereof, and not requiring strong power to block by installing one spring extended and shrunk on the single movement inclined surface.

Description

A door intercepting unit

The present invention relates to a shielding apparatus for a door made of tempered glass and wood, and more particularly, to a shielding apparatus for shielding a gap formed between a door and a door frame, that is, upper, lower and side surfaces, To prevent entrance of outside heat or cold air, and at the same time to prevent entry of dust and harmful insects.

Generally, doorways such as public buildings and large buildings are provided with reinforced glass with an inside view, or with iron or wood doors to prevent the interior from being visible.

Such a door is provided at one side of the door frame with a door that rotates about the upper and lower hinge axes to open and close the door, and the door constructed as described above is composed of a single door with a door or a double door with a pair opened at both sides.

The door of the above-described door made of tempered glass and iron is generally made in a square panel shape on a part of upper and lower sides, and a hinge shaft is connected to one side and the edge face of the door hits the lower part, So as to rotate about the hinge axis while maintaining a small clearance.

On the other hand, one side of the general door is bound to the door frame and the hinge, and the door is rotated around the hinge.

When the door is installed so as to have a small clearance, air, dust, and noise from the outside are directly introduced into the room through the gap, thereby changing and polluting the room air.

In particular, there has been a problem in that a shielding device for covering the gap between the reinforced glass door and the lower floor of the reinforced glass door can not be provided due to the part of the floor hinge arm joined to each pipe of the reinforced glass door.

In order to solve the above-mentioned problems, the patent application No. 848208 (name: door shielding means) has been provided. To simplify the structure, the door shielding device is vertically and horizontally Shielding means is provided, and the shielding means is configured to engage such that a rhombic groove and a cylindrical groove are continuously formed.

However, it has been found that the above-mentioned door shielding device can not block the clearance between the upper and the side by blocking only the lower portion of the door, so that the conventional problems remain. Particularly, the shielding means composed of the rhombic- When the pressure transmitting means is operated, the center of the operating member is moved downward by the inclined surface of the upper panel, so that the repulsive force is weakened off the center of the pressure transmitting means, that is, The latch which is pressed down also moves downward and generates an uncomfortable noise due to the movement friction with the door frame. In addition, a spring provided vertically and vertically on a single block of the shape of a marble has a structure in which when the pressure transmitting means is actuated, the upper spring is tensioned and the lower spring is compressed, so that the compressive force applied to the operating piece overcomes the pair of spring forces There is a problem that a large force is required to be applied to the upper and lower panels. In order to overcome this difficulty, There is a problem that the production cost rises.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems as described above. It is an object of the present invention to improve the conventional door shielding device to shield not only the lower space of the door frame and the door but also the upper and side spaces thereof by the shielding means, The shielding means for shielding the lower portion can simplify the number and shape of members constituting the shielding means compared with the conventional ones and can reduce the manufacturing cost, and the single spring, which is tensioned and compressed, And to provide a door shielding device which does not require a force.

The present invention is configured as follows to achieve the above object. That is, in a door formed of a door frame and a door so as to be opened or closed by a door or a door, and the door being formed of tempered glass or iron or wood, the door comprises an upper frame provided at the upper end of the door and an upper frame provided at the lower end, An upper closure member provided on the upper frame to close a clearance between the door and the door frame; and an upper closure provided in the lower frame and having a horizontal movement and a vertical movement A lower shielding means for closing the lower gap, and a side closure member provided on a side surface of the door frame for closing a gap between the door and the door frame.

In addition, the lower shielding means is formed to be long in the longitudinal direction and is slidably seated on the upper surface of the receiving portion formed in the lower frame, and a plurality of first through holes are formed at regular intervals, A horizontal moving member having a first inclined surface and provided in a direction provided with a floor hinge axis for rotating the door or having moving means provided in the other direction and moving in the horizontal direction, The second through hole and the second inclined surface are formed at positions corresponding to the first through hole and the first inclined surface of the horizontal shifting member so that the first and second through holes communicate with each other, A vertically moving member vertically movable up and down with a moving force of the horizontal moving member in a state in which the horizontal moving member is in contact with the vertical moving member, a vertical spring inserted into the first and second through holes, And the lower closure member is provided on the lower surface of the vertically movable member so as to close the gap in the lower portion.

The central closing member is formed in a long side in the longitudinal direction, and a buffer hole is formed in the inside of the central closing member.

As described above, according to the present invention, all the gaps that may occur in a door of a door or a door can be blocked by using the upper closure member, the lower closure member, the side closure member and the center shield member, It is possible to prevent the intrusion of harmful worms while blocking the dust, and to simplify the construction of the moving means and the lower shielding means, thereby remarkably lowering the manufacturing cost.

In addition to the effect that the moving means for transmitting the moving force of the horizontal movement and the vertical movement of the lower blocking means provides a simple operation by the pulling of the magnetic force or the pressing of the latch, There is an effect.

Further, since the horizontal shut-off means and the vertical shut-off motion are simultaneously performed by the inclined surfaces of the lower shut-off means, the structure is simple and the moving force provided by the moving means can be provided without loss.

1 is a front view showing a door for a door according to the present invention;
Fig. 2 is a side sectional view of Fig. 1
3 is an exemplary view showing an upper closure member according to the present invention
Fig. 4 is an exemplary view in which the upper closure member according to the present invention is installed on the shim member
5 is an exploded perspective view showing a lower shielding unit provided with a magnetic force moving means according to the present invention.
Fig. 6 is an enlarged perspective view of Fig.
7 is a perspective view of the combined perspective view of FIG.
Fig. 8 is a perspective view showing a state in which the lower shielding means is operated in Fig. 7
Figure 9 is a cross-
10 is a side sectional view of Fig. 7
11 is a front cross-sectional view
Fig. 12 is a side sectional view of Fig. 9,
13 is a cross-sectional view of a front section
14 is a cross-sectional view
15 is a front view showing a side door according to the present invention
Fig. 16 is a front cross-sectional view taken along the plane of the floor hinge and operated by a moving means using a latch
17 is a plan view showing the activated state of Fig. 16
Fig. 18 is a front sectional view showing a state in which a moving means using magnetic force is installed in a double-
19 is an exemplary view showing a flat cross section of a side closure member according to the present invention
20 is a plan view showing the central closing member according to the present invention
21 is a plan view showing a central closing member made of a magnetic material according to the present invention
22 is an exemplary plan view showing a central closing member according to the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 15, the door 100 of the present invention comprises a door frame 2 and a door 1 which is installed on the door frame 2 and which is opened and closed, A lower shielding means 30 for closing the lower portion of the door 1, and a side closing member 50 for closing the side surface of the door 1.

As shown in FIG. 2, the door 100 may be a one-door type in which one door 1 is installed, or a double door type in which the door 100 is widely opened. The door 1 may be made of tempered glass, It is made of wood.

As shown in FIGS. 2 and 16, the upper and lower portions of the door 1 are provided with upper and lower frames 11 and 12, respectively. And a floor hinge shaft 101 for allowing the door 1 to rotate in the door frame 2 is inserted into the upper and lower frames 11 and 12 so that the inside is hollow, And a rectangular panel 102 having a bolt hole 107 and a through hole 105 is formed on one side of the rectangular panel 102. The movable bolt B is inserted into the hollow portion through the opening of the rectangular panel 102, A bolt hole 106 is formed so as to be inserted into the bolt hole 107 and a through hole 104 is formed in a downward direction spaced apart from the bolt hole 106 so that a moving bolt B So that the floor arm 103 is disposed at a predetermined position where the floor hinge shaft 101 is inserted. It is.

As shown in FIG. 3, the upper closure member 20 is provided on the upper surface of the door 1 or on the upper surface of the upper frame 11 so as to be long in the longitudinal direction, The buffer hole 21 may be formed in a vertically protruding shape or may have a bent upper end such that the buffer hole 21 is formed therein. When the buffer hole 21 is formed as described above, when the door 1 is closed, The sealing effect can be further enhanced.

The upper closure member 20 may be installed in the door 1 in a single unit, and may be provided in a plurality of pairs in order to enhance the effect of blocking external air and dust.

The upper closure member 20 may be fixed to the upper surface of the door 1 by using an adhesive such as silicone or a bond or may have a groove 23 on the upper surface thereof, And the upper closure member 20 is fixedly inserted into the fitting member 22 fitted into the groove 23. The fitting member 22 is formed with one groove 23 Or a plurality of grooves 23 may be formed on both sides of the upper closure member 20 so as to sandwich the upper closure member 20, respectively.

The lower shielding means 30 is installed so as not to be exposed to the lower or lower frame 12 of the door 1 as shown in FIGS. 5 to 8 attached thereto. When the door 1 is closed, The horizontal moving member 31 is formed to have a rectangular shape elongated in the longitudinal direction and inserted into the lower frame 12 to be disposed on the upper side, The movable member 31 is formed with a plurality of first through holes 311 formed at predetermined intervals in the longitudinal direction and formed as long holes and the first inclined surface 311 is formed on one side or both sides of the inner side surface of the first through hole 311 312 are formed.

Moving means 41, 42 and 43 for automatically moving the horizontal shifting member 31 in the horizontal direction when the door 1 is closed are formed at one end of the horizontal shifting member 31 .

The horizontal moving member 31 includes a second through hole 321 and a second inclined surface 322 in a shape and position corresponding to the first through hole 311 and the first inclined surface 312, (32) is arranged below the horizontal moving member (31).

The first and second through holes 311 and 321 are connected to each other and a vertical spring 33 is inserted into the first and second through holes 311 and 321, The first and second through holes 311 and 321 are formed to be hung in the first and second through holes 311 and 321 to provide a compressive force so that the first and second inclined surfaces 312 and 322 can be kept in contact with each other.

A lower closure member 34 is formed on the lower surface of the vertically movable member 32 and extends in the longitudinal direction of the door 100. The side surface of the lower closure member 34 is shaped like a dust It is preferable that a closure part 341 formed of a plurality of clogged layers can be provided because the clogged particles are scattered and the clogged particles can easily enter.

When the door 100 is of a monogram type, the installation position of the moving means 41, 42, 43 is arranged in the direction opposite to the direction in which the floor hinge shaft 101 is inserted, And is installed in the direction in which the shaft 101 is inserted.

This is because the moving means 41, 42 and 43 to be explained are operated in the configuration of the door frame 1 erected vertically so that the door form is installed in the direction of the handle, And is provided in the direction of the floor hinge shaft 101 because the door frame 2 is not provided in the handle direction.

Therefore, the description of the components of the moving means 41, 42, and 43 will be made by distinguishing the installation in the other direction in which the floor hinge shaft 101 is provided, that is, the direction in which the handle and the floor hinge shaft 101 are provided I will explain.

First, as shown in FIGS. 5 to 12, the one-way type moving means 41 installed in the handle direction provides a compressive force and a restoring force to one side of the horizontal moving member 31 protruding in the door frame 2 direction A door frame 412 is provided so as to expose one end of the door frame 2 corresponding to a position corresponding to the door magnetic body 411, Lt; / RTI >

Here, when the door is closed, the door magnet 411 and the door frame magnetic body 412 are installed so that their poles face each other. When the door is closed, the door magnet 411 is pulled by gravitation and the horizontal moving member 31 is pulled And simultaneously the first inclined surface 312 pushes the second inclined surface 322 downward along the inclined surface so that the vertically movable member 32 pulls the vertical spring 33 and the lower closing member 34 moves to the gap At this time, even if the first and second through holes 311 and 312 cross each other due to horizontal and vertical movements, since the shape of the first and second through holes 311 and 312 is formed as a long hole, the vertical spring 33 is pulled, I will not.

Further, the vertically moving member 32 is hooked on the vertical spring 33, so that the vertically movable member 32 is raised and lowered without falling down.

Accordingly, the first inclined surface 311 and the second inclined surface 312 are formed to have a high handle direction and a low inclined surface in the direction of the floor hinge shaft 101 so that the vertically moving member 32 can be elevated and lowered through the pulling operation.

Alternatively, as shown in Figs. 13 and 14, the moving means 42 installed in the direction of the handle may include a horizontal spring (not shown) for providing a compressive force and a restoring force to one side of the horizontal moving member 31, A latch 421 formed with a curved surface on one side or both sides in a state in which the door 44 is interposed is exposed so as to be exposed to the door so as to provide a pushing force to the door frame 2 through contact.

When the latch 421 exposed to the outside of the door frame 2 is gradually brought into contact with the door frame 2 when the door 1 is closed, the moving means 42 constituted by the latch 421 presses the horizontal spring 44 The first and second inclined surfaces 312 and 322 are lowered in the handle direction and lowered to the floor hinge axis 101 ) Direction is formed with a high inclined surface. That is, unlike the inclined surface of the moving means 41 which is made of a magnetic material and pulls and moves, the inclined surface is formed in the reverse direction by the pressing operation.

Alternatively, as shown in FIGS. 16 and 17, the side moving means 43 provided in the direction of the floor hinge shaft 101 is disposed in the direction in which the floor hinge shaft 101 is provided, A latch 421 having a curved surface formed on one side or both sides with a horizontal spring 44 interposed therebetween for providing a compressive force and a restoring force is provided on one side of the floor hinge shaft 101 protruding in the direction of the door frame 2 provided with the floor hinge shaft 101, Is configured to be exposed to the door (1) to provide a force to push the door (2) with the latch (421) into contact.

At this time, the first and second slanted surfaces 312 and 322 are provided with a high handle direction and a low inclined surface with respect to the floor hinge shaft 101 so that the lower closure member 34 can be lowered by the pressing operation of the latch 421 .

The latch 421 of the moving means 43 provided in the direction of the floor hinge shaft 101 is installed close to the floor hinge shaft 101 so that the rotational distance at which the door 1 is rotated and closed is shorter than the handle direction do. When the rotation distance is shortened, the distance by which the latch 421 is pressed is also shortened, so that the height of the lower closure member 34 is lowered.

A guide member 431 is provided on the door frame 2 corresponding to the latch 421 so as to increase the moving distance of the latch 421. The guide member 431 is provided on the door hinge shaft 101 in the direction of the floor hinge shaft 101, Both sides of the guide member 431 are formed to be lower than the height of the door frame 2 so that the latch 421 pushed out when the door 1 rotates has a depth which is not disturbed, Or protruding portions 432 formed in an inclined triangular shape and having the same height as the door frame 2 are provided so that the latch 421 is guided by the curved or inclined protruding portions 432, So that they can compensate for distance.

The moving means 43 provided in the direction of the floor hinge shaft 101 is installed to pass through one end of the floor arm 103 and the rectangular panel 102 into which the floor hinge shaft 101 is inserted, The latch 421 can engage with the horizontal moving member 31 through the through holes 104 and 105 formed in the downward direction of the bolt holes 106 and 107 of the rectangular panel 102.

In this case, when the door 100 is a side door, the moving means 43 can be installed in the direction in which the floor hinge shaft 101 is provided, or when the doors are closed and facing each other as shown in FIG. 18, So that the moving means 41 using the magnetic body can be installed.

The horizontal moving member 31 is moved in the horizontal direction by the moving means 41, 42 and 43 and the vertical moving member 32 is lowered by the moving force, The vertical movement member 32 is formed to have the same length as the inner length of the lower frame 12 to prevent the horizontal movement member 32 from being pushed horizontally, Both ends of the movable member 32 are brought into contact with the inner surface of the lower frame 12, so that the movable member 32 easily ascends and descends.

Further, the connection between the vertically-moving member 32 and the lower closure member 34 may be directly fixed, or the height of the lower closure member 34 may be lowered, and at the same time, do.

As shown in FIGS. 5 to 8, the connecting member 35 forms a slide protrusion 351 to be inserted into a slide groove formed at both sides of the vertically moving member 32 in the downward direction, And an engaging groove 352 is formed to receive and engage with the upper surface of the base plate 34.

A support portion 121 is formed on both inner side surfaces of the lower frame 12 so as to protrude from the vertical springs 33 so that the center of the support portion 121 is not interfered with. 31) is seated. 42, and 43 can be guided smoothly smoothly by forming the receiving portion 121 so as to support the horizontal moving member 31. At the same time, in addition to the horizontal moving member 31, So that the load generated vertically by the vertically movable member 32 is suppressed, and the vertical spring 33 is also tensioned.

19, the side closure member 50 is fitted in and fixed to a groove 51 formed on the inner surface of the door frame 2 vertically installed in the direction of the floor hinge shaft 101, A buffer hole 52 for increasing shock absorption and elastic force is formed in the inside of the groove 51 and when the side closure member 50 is fitted and fixed in the groove 51, It is preferable that the side surface is formed so as to be inclined or curved so as to come into contact with the side surface of the door 1 so that it can be brought into close contact without interference when the door is rotated.

In addition, when the door 100 is a side door, a central closing member 60 is provided to close a clearance which occurs on one side of the pair of doors 1 facing each other, thereby preventing inflow of outside air and dust, (100).

20, the central closing member 60 is elongated in the longitudinal direction, and a buffer hole 61 is formed therein. A fitting groove 62 is formed in a side surface of the central closing member 60, And the side surface of the door 1 is inserted and fixed into the fitting groove 62.

Alternatively, the central closing member 60 may be closed by using a magnetic force when the two side doors 1 are closed as shown in FIG. 21, and at the same time, (63).

Alternatively, as shown in FIG. 22, the central closing member 70 may have a vertically elongated fitting slot 72 on one side of the opposite side door 1 facing each other, And the other side is formed to be inclined or curved so as to be in contact with each other when the door is closed, and a buffer hole 71 for absorbing impact and reinforcing elastic force is formed inside the door .

The material of the central closure members 60 and 70 excluding the upper closure member 20, the lower closure member 34, the side closure member 50 and the magnetic substance 63 is made of silicone or rubber And the like. [0035] The above-described embodiments are not limited thereto.

The door shielding device of the present invention constructed as described above has a horizontally moving member 31 that moves horizontally by the operation of the moving means 41, 42, 43, While the second inclined surface 322 guided by the first inclined surface 312 of the door frame 1 can lower the vertically movable member to easily close the lower clearance, The door, the door, the door, the door, the door, and the like.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea of the present invention.

Door: 100 Door: 1
Door frame: 2-phase, lower frame: 11,12
Support base: 121 Floor hinge axis: 101
Square Panel: 102 Floor Arm: 103
Through hole: 104,105 Upper closing member: 20
Cushioning ball: 21,52,61 Shim member: 22
Lower shielding means: 30 Horizontally displaceable member: 31
First through hole: 311 First inclined surface: 312
Vertically moving member: 32 2nd through hole: 321
Second slope: 322 Vertical spring: 33
Lower closure member: 34 Closure member: 341
Connection member: 35 Slide protrusion: 351
Hanging groove: 352 Moving means: 41, 42, 43
Door Magnetic: 411 Door Magnetic: 412
Latch: 421 Guide member: 431
Protrusion: 432 Horizontal spring: 44
Side closure member: 50 groove: 51
Central closing member: 60 fitting groove: 62
Magnetic body: 63 Central closing member: 70

Claims (10)

In a door 100 comprising a door frame 1 and a door frame 2 so as to be opened or closed in a door or door shape and in which the door door 1 is made of tempered glass or iron or wood,
A lower frame 12 provided at an upper end of the door 1 and provided with a receiving part 121 formed at a lower end of the door 1 and protruding from both sides of the door to open the center;
An upper closing member (20) installed on the upper frame (11) to close a gap between the door (1) and the door frame (2);
A lower shielding means (30) installed on the lower frame (12) and provided with a horizontal movement force to close the lower gap through horizontal movement and vertical movement; And
And a side closing member (50) provided on a side surface of the door frame (2) for closing a gap between the door (1) and the door frame (2).
2. The apparatus according to claim 1, wherein the upper closure member (20)
The upper portion of the upper frame 11 is adhered to one side or both sides of the upper surface of the upper frame 11 or is seated and fixed in a state of being fitted to the connecting fitting member 22 so that the upper portion is close to the inner surface of the door frame 2 when the door is closed, Wherein the shape of the door is one of a vertically protruding shape or a shape in which a buffer hole (21) is formed therein.
The apparatus according to claim 1, wherein the lower shielding means (30)
A plurality of first through holes 311 are formed in a long hole at predetermined intervals so as to be slidably seated on the upper surface of the receiving portion 121 formed in the lower frame 12, A first inclined surface 312 is formed on the inner surface of the hole 311 and a floor hinge shaft 101 for rotating the door 1 and its floor hinge shaft 101 are inserted, A horizontal moving member 31 which is installed in the direction in which the floor arm 103 is installed or moved in the horizontal direction through the moving means 41, 42 and 43 installed in the other direction;
And is formed as a long hole at a position corresponding to the first through hole 311 and the first inclined surface 312 of the horizontal shifting member 31, The first and second through holes 321 and 322 are formed so that the first and second through holes 311 and 321 communicate with each other and the first and second inclined surfaces 312 and 322 are horizontally moved A vertically movable member 32 formed to vertically move by a moving force of the member 31;
A vertical spring 33 inserted into the first and second through holes 311 and 312 to be hung on the upper and lower sides, respectively; And
And a lower closure member (34) mounted on a lower surface of the vertically-moving member (32) to close the lower gap.
4. The apparatus according to claim 3, wherein the moving means (41)
The door hinge shaft 101 is provided in the other direction and a magnet member 411 for engaging with the horizontal spring 44 interposed therebetween is provided at one projecting end of the horizontal moving member 31, And the door frame magnetic body 411 and the door frame magnetic body 412 are arranged in mutually different poles so that the doors 1 and 2 are provided with inserts so that one end is exposed in the door frame 2 corresponding to the magnetic body 411, , The horizontal moving member (31) is moved in the horizontal direction by a force.
4. The apparatus according to claim 3, wherein said moving means (42)
A latch 421 is provided which is disposed in the other direction provided with the floor hinge shaft 101 and engaged with the horizontal spring 44 at one projecting end of the horizontal moving member 31, Wherein when the latch (421) is brought into contact with the door frame (2), the horizontal moving member (31) is moved horizontally while compressing the horizontal spring (44).
4. The apparatus according to claim 3, wherein the moving means (43)
A horizontal moving bolt hole 106 formed in the floor arm 103 in a state in which the horizontal hinge shaft 101 is provided and a horizontal spring 44 is provided at one projecting end of the horizontal moving member 31, And a through hole 104 formed in the downward direction of the bolt hole 107 formed in the rectangular panel 102. The latch 421 is coupled to the through hole 104 through a through hole 104 formed in the downward direction of the bolt hole 107, And a guide member (431) provided with a protrusion (432) projecting gradually toward the center from both sides of the door (1).
2. The apparatus according to claim 1, wherein the side closure member (50)
And is inserted into and fixed to a groove 51 formed on the inner side of the door frame 2 which is erected vertically and is formed to be long in the longitudinal direction with a buffer hole 52 formed therein, Wherein the door is configured to protrude outward.
2. The apparatus according to claim 1, further comprising a central closing member (60) provided on one side of the pair of doors (1)
Wherein the central closing member (60) is elongated in the longitudinal direction, and a buffer hole (61) is formed therein, and a fitting groove (62) is formed on a side where the door (1) is inserted.
2. The apparatus according to claim 1, further comprising a central closing member (60) provided on one side of the pair of doors (1)
Wherein the central closing member (60) comprises a magnetic body (63) formed to be long in the longitudinal direction so that the door (1) is maintained in the central closed state and the fixed state when the door (1) is closed.
The door according to claim 1, further comprising a central closing member (70) provided on one side of a pair of door doors (1)
The central closing member 70 is formed with a fitting slot 72 on one side of a door facing each other and has one side fixed to the fitting slot 72 and a buffer hole 71 formed therein .

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