KR102163027B1 - Mobile scaffolding device - Google Patents

Abstract

The present invention relates to a mobile scaffolding apparatus having a safety railing, which can be freely moved in accordance with an installation position of a workplace and prevents falling of a worker. To this end, the mobile scaffolding apparatus includes: a scaffold on which the worker boards to perform a work; and a safety railing installed along an upper side of the scaffold.

Description

Mobile frame scaffolding device {MOBILE SCAFFOLDING DEVICE}

The present invention relates to a movable frame scaffolding device, and more particularly, to a movable frame scaffolding device provided with a safety railing capable of freely moving according to an installation location of a workplace and preventing a fall of an operator.

For the mobile scaffold, a horizontal pipe (horizontal lobster) is installed between the two pillars, and the integrated two juttles are placed at a distance, and a support frame is installed across the upper part of the pillar pipes between the pillars. , It is completed by installing a working scaffold on the support frame, and moving by attaching each wheel to the pillar pipes, and allowing the scaffold to rise and work where necessary.

A reinforcing pipe (reinforcing material) is installed under the horizontal pipe to increase structural stability, and a lifting platform is installed between the horizontal pipe and the reinforcing pipe to allow the movable scaffold to be raised and lowered. It is installed in an X-shape to increase the structural stability of the mobile scaffold.

In the movable scaffold, a safety railing is installed along the rim of the scaffold to prevent safety accidents during work, and the safety railing is installed from the scaffold by inserting a vertical pipe forming the corner of the safety railing into a projection protruding from the top of the column pipe .

However, since the height of the safety railing from the scaffolding is always constant, there is a problem that the safety railing cannot be installed if there is an obstacle that interferes with the safety railing, and the safety railing is arbitrarily removed for convenience of work. There is a problem of using the railing, and there is a problem that the safety railing and other members are lost or lost because the safety railing is in a separate state during storage, transportation, and movement.

In the case of the existing safety hook fastening device, in order for the safety hook to pass through the corner of the device, it is inconvenient that the movement must be continued only after the safety hook fastened to the device after moving after unfastening the safety hook fastened to the device. As a result, there was a limitation in that the worker had no choice but to be protected by the safety hook for a while when the safety distance was unlocked.

On the other hand, the above-described background technology is technical information that the inventor possessed for derivation of the present invention or acquired during the derivation process of the present invention, and is not necessarily a known technology disclosed to the general public prior to filing the present invention. .

Korea Open Utility Model No. 20-2011-0009067 Korean Utility Model Registration No. 20-0122098

One aspect of the present invention provides a movable frame scaffolding device provided with a safety railing that can be freely moved according to the installation location of the workplace and can prevent an operator from falling.

The technical problem of the present invention is not limited to the technical problem mentioned above, and other technical problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

A mobile frame scaffolding device according to an embodiment of the present invention includes a scaffolding for a worker to work on board; And a safety railing installed along the upper side of the scaffold.

In one embodiment, the scaffold includes two juttles integrated by installing a horizontal pipe between two pillar pipes; Wheels installed on each lower side of the pillar pipe; A scaffold formed in the shape of a square plate so that a worker can board and perform a job, and is seated on the upper side of the two jumles; And a hoisting platform extending from a horizontal bar installed across the lower sides of the two juttles to the scaffolding so that the operator can go up and down with the scaffolding.

In one embodiment, the safety railing, four supports installed on the upper side of each corner of the scaffold; A safety hook installed on a seat belt worn by a worker to prevent falls, and a safety hook fastening ring seated on the four supports; And a plurality of ring supports installed along the rim of the footrest to support the safety ring fastening ring so that it is not inclined.

In an embodiment, the ring support includes a support frame extending in a vertical direction; It is connected and installed so that the lower part is rotatable in the rotation groove formed on the upper part of the support frame, and is uprightly inserted into a fastening groove formed in a fan shape on the lower side of the safety ring fastening ring to support the safety ring fastening ring. Rotating frame; And formed in a spherical shape and installed on the upper side of the rotating frame, and moving along an arch groove formed in an arch shape along the upper side of the fastening groove as the rotating frame rotates, and when seated in the arch groove, the arch It may include a; fastening sphere that is fastened to the groove to prevent the safety ring fastening ring from moving in the vertical direction.

In one embodiment, the support is formed to be bent in a "a" shape, the corner frame is installed to be spaced apart from one corner of the footboard upward; A vertical frame supporting the corner frame at one corner of the footrest; It is formed extending from each end of one side and the other side of the corner frame, and one side facing the safety ring fastening ring is formed to be rounded in response to the corner curvature of the safety ring fastening ring, and the safety ring is not obstructed and the safety ring A mounting frame spaced apart from and installed from the safety ring fastening ring so as to move along the fastening ring; And an inclined frame extending from the vertical frame to a lower side of the seating frame to support the seating frame.

In one embodiment, the safety ring fastening ring is formed in the shape of a square ring corresponding to the shape of the rim of the footrest so that the safety ring is fastened and moved, and the ring body is rounded so that each corner is rounded; And the ring body is rotatably connected to each rounded corner of the ring body, and is seated on the upper side of the seating frame so that the ring body is not inclined to support the ring body, and the safety ring moves along the ring body. When in close contact, the safety ring is rotated in the moving direction of the safety ring by the pushing force and inserted into the seating groove formed on the upper side of the ring body, and when the safety ring is distant, it is rotated again from the seating groove to the upper side of the seating frame. It may include; a fastening ring that is seated and supports the ring body again.

In one embodiment, the scaffolding is connected to the lower portion of the pillar pipe so as to be rotatable, and the support portion pivoting from the pillar pipe to support the bottom surface so as not to move when a worker boards the scaffold; further includes can do.

In one embodiment, the support portion, an upper connecting rod that is connected and installed so that the upper end is rotatable to one side of the column pipe; A lower connecting rod facing the upper connecting rod and spaced apart from the upper connecting rod so that an upper end thereof is rotatably connected to one side of the column pipe; And a pedestal that is connected and installed so that each lower end of the upper connecting bar and the lower connecting bar is rotatable and rotates downward to support the bottom surface.

In one embodiment, the support portion is formed in a curved shape in a downward direction and is installed on one side of the upper connecting rod, and an upper rack gear and a lower rack gear extend along the upper and lower surfaces, and the column pipe It may further include a; curved gear sliding along the formed through hole.

In one embodiment, the through hole may be formed to pass through the column pipe in a downward direction corresponding to the curvature of the curved gear.

In one embodiment, the column pipe is installed in engagement with the curved gear seated in the through hole, and the curved gear slides along the through hole so that the end of the curved gear is exposed to the other side. Accordingly, by reducing the vertical height of the through hole may be provided with a close fastening portion for fastening the curved gear to prevent movement.

In one embodiment, the close fastening portion, a rotation lever connected to the front end of the pillar pipe; It is rotatably connected and installed inside the column pipe so that the lower part is partially exposed to the upper side of the through hole, and the lower part is engaged and connected to the upper rack gear, and the curved gear is transferred while rotating together as the rotating lever rotates. Upper gear that allows you to; A mounting base installed in the inner space of the column pipe, the upper portion being formed in a shape corresponding to the lower shape of the curved gear, forming a lower side surface of the through hole, and supporting the curved gear; It is connected and installed to one side or the other side of the upper part of the seating table so that the upper part is exposed to the upper side of the seating table so as to be rotatable inside the seating table, and the upper part is engaged with the lower rack gear to be connected and installed as the curved gear rotates. A first lower gear rotating together; A second lower gear engaged with and connected to the first lower gear at one lower side or the other side of the mounting table and rotated together as the first lower gear rotates; An s base plate installed under the inner space of the pillar pipe; At least one support spring installed on the upper side of the base plate; A bottom plate seated on the upper side of the support spring; And a rack gear extending in a vertical direction and installed on one or the other side of the bottom plate, and a rack gear extending in a vertical direction along one side is engaged and connected to the second lower gear to rotate the second lower gear. It may include a; vertical rack gear to lift or lower according to the.

According to one aspect of the present invention described above, it is possible to freely move according to the installation position of the workplace, and by preventing the operator from falling, it is possible to provide an effect of improving the work efficiency by allowing the operator to stably perform the notification operation. I can.

The effects of the present invention are not limited to the above-mentioned effects, and various effects may be included within a range apparent to those of ordinary skill in the art from the contents to be described below.

1 is a view showing a schematic configuration of a mobile frame scaffolding apparatus according to an embodiment of the present invention.
Figure 2 is a view showing the safety railing of Figure 1;
3 and 4 are views showing the ring support of FIG. 2.
5 to 7 are views showing a connection relationship between the support and the safety ring fastening ring of FIG. 2.
8 is a view showing another embodiment of the scaffold of FIG.
9 is a view showing another embodiment of the support of FIG. 8.
10 and 11 are views showing an intimate fastening part according to the present invention.
12 is a view for explaining the fastening of the curved gear by the close contact portion of FIG.

DETAILED DESCRIPTION OF THE INVENTION The detailed description of the present invention to be described later refers to the accompanying drawings, which illustrate specific embodiments in which the present invention may be practiced. These embodiments are described in detail sufficient to enable a person skilled in the art to practice the present invention. It is to be understood that the various embodiments of the present invention are different from each other, but need not be mutually exclusive. For example, certain shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the present invention in relation to one embodiment. In addition, it is to be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the present invention. Accordingly, the detailed description to be described below is not intended to be taken in a limiting sense, and the scope of the present invention, if properly described, is limited only by the appended claims, along with all scopes equivalent to those claimed by the claims. Like reference numerals in the drawings refer to the same or similar functions over several aspects.

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

1 is a view showing a schematic configuration of a mobile frame scaffolding apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a mobile frame scaffolding device 1 according to an embodiment of the present invention includes a scaffolding 10 and a safety railing 20.

The scaffolding 10 forms a work space for the worker P to board and work, and a safety railing 20 is installed on the upper side.

In one embodiment, the scaffolding 10 includes two jumles 100, a wheel 200, a scaffolding 300 and a platform 400.

Juteul 100 is made by installing a horizontal pipe 120 between the two pillar pipes 110, the two are connected and installed by a horizontal bar 130 to be integrated, and the footrest 300 is installed on the upper side.

Wheel 200 is installed on each lower side of the column pipe 110 for the movement of the present invention.

The scaffolding 300 is formed in the shape of a square plate so that the worker P can ride and perform work, and is seated on the upper side of the two jumles 100.

The lifting platform 400 is installed extending from the horizontal bar 130 installed across the lower side of the two jumles 100 to the scaffold 300 so that the worker P can rise and fall to the scaffold 300.

The safety railing 20 is installed along the upper side of the scaffold 10 so as to prevent the worker P from falling from the scaffold 300 and suffering a safety accident.

The movable frame scaffolding device 1 according to an embodiment of the present invention having the configuration as described above can be freely moved according to the installation position of the workplace, and by preventing the worker P from falling, the worker P The work efficiency can be improved by allowing the company to perform the notice work stably.

Figure 2 is a view showing the safety railing of Figure 1;

Referring to FIG. 2, the safety railing 20 includes four supports 500a, 500b, 500c, and 500d, a safety hook fastening ring 600, and a plurality of ring supports 700.

Each support (500a, 500b, 500c, 500d) is installed on the upper side of each corner of the footrest 300 to support the rounded corners (Ra, Rb, Rc and Rd) of the safety hook fastening ring 600 .

The safety hook fastening ring 600 is fastened with a safety hook installed on the seat belt worn by the worker P to prevent falls, and each corner is seated on the four supports 500a, 500b, 500c, and 500d. .

The ring support 700 is installed along the rim of the foot plate 300 to support the safety ring fastening ring 600 so that it is not inclined.

The safety railing 20 having the configuration as described above not only can prevent the worker P from moving over the railing so as to prevent the worker P from falling on a high ground and suffering a safety accident, As the safety hook (S) is fastened, it is possible to prevent falling to the floor by mounting the worker (P) even in the event of a fall.

3 and 4 are views showing the ring support of FIG. 2.

Referring to FIG. 3, the ring support 700 includes a support frame 710, a rotation frame 720, and a fastening sphere 730.

The support frame 710 is extended in a vertical direction, and a rotation frame 720 is connected to a rotation groove 711 formed thereon.

The rotating frame 720 is connected and installed so that the lower part is rotatable in a rotating groove 711 formed on the upper part of the support frame 710, and is upright in a fan shape on the lower side of the safety hook fastening ring 600. It is inserted into the formed fastening groove 630 to support the safety ring fastening ring 600, and a fastening sphere 730 is installed on the upper side.

The fastening sphere 730 is formed in a spherical shape and installed on the upper side of the rotating frame 720, and as the rotating frame 720 rotates, an arch groove 640 formed in an arch shape along the upper side of the fastening groove 630 ), and when seated in the arch groove 640, it is fastened to the arch groove 640 to prevent the safety hook fastening ring 600 from moving in the vertical direction, so that the safety hook fastening ring 600 It is possible to prevent the safety ring fastening ring 600 from being separated from the support frame 710 according to the rattle in the direction.

The ring support 700 having the configuration as described above is usually safe to support the safety ring fastening ring 600 stably even when the safety ring S moving along the safety ring fastening ring 600 Support the lower side of the ring fastening ring 600, but when the safety ring (S) is in close contact, it rotates in the moving direction of the safety ring (S) so that the safety ring (S) passes, and then returns to the fastening groove 630 again. It is possible to support the safety ring fastening ring 600.

5 to 7 are views showing a connection relationship between the support and the safety ring fastening ring of FIG. 2.

Referring to FIG. 5, the support 500 includes a corner frame 510, a vertical frame 520, a seating frame 530, and an inclined frame 540.

The corner frame 510 is bent in a "a" shape and is installed to be spaced upward from one corner of the scaffold 300 and supported by the vertical frame 520.

The vertical frame 520 supports the corner frame 510 at one corner of the footrest 300.

The seating frame 530 is formed extending from each end of one side and the other side of the corner frame 510 and supported by the inclined frame 540, and one side 532 facing the safety hook fastening ring 600 is a safety ring It is formed to be rounded in response to the curvature of the corner of the fastening ring 600, and is installed spaced apart from the safety ring fastening ring 600 so that the safety ring S can move along the safety ring fastening ring 600 without being disturbed.

In one embodiment, the seating frame 530 is formed to be stepped downward by the height of the fastening ring 620 from the corner frame 510 to form a space 531 in which the fastening ring 620 can be seated. have.

The inclined frame 540 is formed extending downward from the vertical frame 520 to the seating frame 530 to support the seating frame 530.

In addition, the safety ring fastening ring 600 includes a ring body 610 and a fastening ring 620.

The ring body 610 is formed in a rectangular ring shape corresponding to the shape of the rim of the footrest 300 so that the safety ring S is fastened and moved, and each corner (Ra, Rb, Rc, and Rd) is rounded. It is formed in a round shape.

The fastening ring 620 is connected and installed so as to be rotatable to each rounded corner (Ra, Rb, Rc, and Rd) of the ring body 610, and the ring body 610 of the seating frame 530 is not inclined. It is seated on the upper side 531 to support the ring body 610, and when the safety ring (S) moves along the ring body 610 and is in close contact, the safety ring (S) is After being rotated in the moving direction and inserted into the seating grooves 651 and 652 formed on the upper side of the ring body 610, the safety ring S is rotated again from the seating grooves 651 and 652 and the seating frame 530 It is seated on the upper side 531 of the ring and supports the ring body 610 again.

In one embodiment, the fastening ring 620 is automatically exposed after being received in the seating grooves 651 and 652 so that it can be seated in the seating frame 530 by inducing the rotation by the elastic force to the rotation shaft 621 It may be provided with an elastic structure (not shown in the drawing for convenience of description) to be able to.

In the case of the existing safety hook fastening device, in order for the safety hook to pass through the corner of the device, it is inconvenient that the movement must be continued only after the safety hook fastened to the device after moving after unfastening the safety hook fastened to the device. As a result, there was a limitation in that the worker had no choice but to be protected by the safety hook for a while when the safety distance was unlocked.

Accordingly, the support 500 and the safety ring fastening ring 600 having the configuration as described above are usually fastened, which is a support structure of the ring body 610 so as to overcome the limitations of the existing safety ring fastening structure described above. The ring 620 is seated on the mounting frame 530 to support the ring body 610, and when the safety ring (S) moves to the corresponding position, the fastening ring 620 is rotated and the mounting grooves 651, 652 After being accommodated in ), the safety ring (S) is exposed again from the seating grooves 651 and 652 to be seated on the seating frame 530 so as to maintain support.

8 is a view showing another embodiment of the scaffold of FIG.

Referring to FIG. 8, the scaffold 10a according to another embodiment includes two jumles 100, a wheel 200, a scaffolding 300, a platform 400, and a support part 800. Here, the two jumles 100, the wheels 200, the footrest 300, and the hoisting platform 400 are the same as those of FIG. 1, so their descriptions will be omitted.

The support part 800 is connected and installed to be rotatable at the lower part of the column pipe 110, and when the worker P boards the footrest 300, the column pipe 110 does not move according to the movement of the wheel 200. ) To support the floor.

In one embodiment, the support part 800 may include an upper connecting rod 810, a lower connecting rod 820 and a pedestal 830.

The upper connecting rod 810 is connected and installed so that the upper end is rotatable to one side of the column pipe 110.

The lower connecting rod 820 faces the upper connecting rod 810 and is spaced apart from the lower side of the upper connecting rod 810 so that the upper end is connected to one side of the column pipe 110 so as to be rotatable.

The pedestal 830 is connected and installed so that the lower ends of the upper connecting bar 810 and the lower connecting bar 820 are rotatable.

In one embodiment, the pedestal 830 may be provided with a spike 840 at the lower side so as to minimize friction with the bottom surface to achieve a more stable close contact.

9 is a view showing another embodiment of the support of FIG. 8.

Referring to FIG. 9, a support part 800 according to another embodiment includes an upper connecting rod 810, a lower connecting rod 820, a pedestal 830, and a curved gear 850.

Here, the upper connecting rod 810, the lower connecting rod 820, and the pedestal 830 are the same as the components of FIG. 7 and thus descriptions thereof will be omitted.

The curved gear 850 is formed in a curved shape in a downward direction and is installed on one side of the upper connecting rod 810, and the upper rack gear 851 and the lower rack gear 852 extend along the upper and lower surfaces. It is formed, and slides along the through hole H formed in the column pipe 110.

In one embodiment, the through hole H may be formed to pass through the column pipe 110 in a downward direction corresponding to the curvature of the curved gear 850.

In one embodiment, the column pipe 110 is engaged and connected to the curved gear 850 seated in the through hole H, and the curved gear 850 slides along the through hole H to be curved As the end of the type gear 850 is exposed to the other side, the vertical height of the through hole H may be reduced to provide a close fastening part 900 for fastening the curved gear 850 to prevent movement.

10 and 11 are views showing an intimate fastening part according to the present invention.

Referring to FIGS. 10 and 11, the close connection part 900 includes a rotation lever 910, an upper gear 920, a seating table 930, a first lower gear 940, and a second lower gear 950. , A base plate 960, a support spring 970, a bottom plate 980, and a vertical rack gear 990.

The rotation lever 910 is connected to the front end of the column pipe 110 and connected to the upper gear 920 to rotate the upper gear 920.

The upper gear 920 is rotatably connected and installed inside the column pipe 110 so that the lower part is partially exposed to the upper side of the through hole H, and the lower part is engaged with the upper rack gear 851 to be connected and installed As the 910 rotates, the curved gear 850 is transferred while rotating together.

The mounting table 930 is installed in the inner space K of the column pipe 110, and the upper portion is formed in a shape corresponding to the lower shape of the curved gear 850 to form the lower side of the through hole H. And supports the curved gear 850.

The first lower gear 940, 940a, 940b is connected to the upper one side or the other side of the seating table 930 so that the upper part is exposed to the upper side of the seating table 930 so as to be rotatable inside the seating table 930 It is installed, and the upper part is meshed with the lower rack gear 852 to be connected and installed to rotate the second lower gear 950 while rotating together as the curved gear 850 rotates.

The second lower gears 950, 950a, 950b are installed in engagement with the first lower gear 940 at one lower side or the other side of the mounting table 930 to rotate together as the first lower gear 940 rotates. In addition, the vertical rack gear 990 is engaged and connected to the vertical rack gear 990 and rotates while being raised or lowered along the vertical rack gear 990.

The base plate 960 is installed under the inner space K of the column pipe 110.

At least one support spring (970, 970a, 970b) is installed on the upper side of the base plate (960).

The bottom plate 980 is seated on the upper side of the support spring 970.

The vertical rack gears 990, 990a, 990b are formed to extend in a vertical direction and are installed on one side or the other side of the bottom plate 980, and a rack gear extending in a vertical direction along one side is a second lower gear. The second lower gear 950 is engaged and connected to 950 to move up or down as the second lower gear 950 rotates.

The close contact coupling portion 900 having the configuration as described above is not normally tightly fastened to the curved gear 850 to the extent that it blocks the movement of the curved gear 850 as shown in FIG. 12A. However, as shown in (b) of FIG. 12, as the curved gear 850 moves, it may be lifted and lowered so that the curved gear 850 may not move.

The above-described embodiments are for illustrative purposes only, and those of ordinary skill in the art to which the above-described embodiments belong can easily transform into other specific forms without changing the technical idea or essential features of the above-described embodiments. You can understand. Therefore, it should be understood that the above-described embodiments are illustrative and non-limiting in all respects. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as being distributed may also be implemented in a combined form.

The scope to be protected through the present specification is indicated by the claims to be described later rather than the detailed description, and should be interpreted as including all changes or modified forms derived from the meaning and scope of the claims and the concept of equivalents thereof. .

1: mobile frame scaffolding device
10: scaffolding
20: safety railing
100: juteul
200: wheel
300: scaffold
400: platform
500: support
600: safety hook fastening ring
700: support
800: base
900: close connection

Claims (2)

Scaffolding for a worker to work on board; And
Including; a safety railing installed along the upper side of the scaffold,
The scaffolding,
Two juttles integrated by installing a transverse pipe between two column pipes;
Wheels installed on each lower side of the pillar pipe;
A scaffold formed in the shape of a square plate so that a worker can board and perform a job, and is seated on the upper side of the two jumles; And
Including; a hoisting platform extending from a horizontal bar installed across the lower side of the two jumles to the scaffold so that the operator can go up and down with the scaffolding;
The safety railing is,
Four supports installed on the upper side of each corner of the scaffold;
A safety hook installed on a seat belt worn by a worker to prevent falls, and a safety hook fastening ring seated on the four supports; And
Includes; a plurality of ring supports installed along the rim of the footrest to support the safety ring fastening ring so as not to incline,
The ring support,
A support frame extending in a vertical direction up and down;
It is connected and installed so that the lower part is rotatable in the rotation groove formed on the upper part of the support frame, and is uprightly inserted into a fastening groove formed in a fan shape on the lower side of the safety ring fastening ring to support the safety ring fastening ring. Rotating frame; And
It is formed in a spherical shape and is installed on the upper side of the rotating frame, and moves along the arch groove formed in an arch shape along the upper side of the fastening groove as the rotating frame rotates, and when seated in the arch groove, the arch groove Includes; a fastening sphere that is fastened to and prevents the safety ring fastening ring from moving in the vertical direction,
The support,
A corner frame bent in a "a" shape and spaced upward from one corner of the scaffold to be installed;
A vertical frame supporting the corner frame at one corner of the footrest;
It is formed extending from each end of one side and the other side of the corner frame, and one side facing the safety ring fastening ring is formed to be rounded in response to the corner curvature of the safety ring fastening ring, and the safety ring is not obstructed and the safety ring A mounting frame spaced apart from and installed from the safety ring fastening ring so as to move along the fastening ring; And
Including; an inclined frame extending from the vertical frame to the lower side of the seating frame to support the seating frame,
The safety hook fastening ring,
A ring body formed in a square ring shape corresponding to the shape of the rim of the footrest so that the safety hook is fastened and moved, and rounded so that each corner is rounded; And
It is connected and installed to be rotatable at each rounded corner of the ring body, and is seated on the upper side of the seating frame so that the ring body is not inclined to support the ring body, and a safety ring moves along the ring body to closely adhere. In this case, the safety ring is rotated in the moving direction of the safety ring by the pushing force and inserted into the seating groove formed on the upper side of the ring body, and when the safety ring is distant, it is rotated again from the seating groove and seated on the upper side of the seating frame. And a fastening ring that supports the ring body again. delete

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