CN211748344U

CN211748344U - Multifunctional chair

Info

Publication number: CN211748344U
Application number: CN201922334734.4U
Authority: CN
Inventors: 杨鹏耀
Original assignee: Huizhou Lianyang Daily Products Co ltd
Current assignee: Huizhou Lianyang Daily Products Co ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-10-27
Anticipated expiration: 2029-12-20

Abstract

The utility model relates to the technical field of chairs, in particular to a multifunctional chair, which comprises a seat unit and a dining chair unit which can be detached from the seat unit, wherein the seat unit comprises a first seat part; the dining chair unit comprises a second seat member detachably connected with the first seat member and a dinner plate detachably connected with the second seat member; also comprises a chair leg unit which is detachably connected with the first seat part or the dinner plate; in actual use, the seat unit and the dining chair unit can be used separately and independently, or can be combined for use, and the dinner plate can be detached from the second seat part, and the chair leg unit can be arranged on the dinner plate for use; the multifunctional application of the chair is realized, the use cost of the chair is reduced, and the user experience is improved.

Description

Multifunctional chair

Technical Field

The utility model relates to a chair technical field especially discloses a multifunctional chair.

Background

In order to facilitate the infant to eat, a dining chair convenient for the infant to use appears in the prior art, the dining chair mainly comprises a seat for bearing the infant and a tray arranged on the seat, and the dining chair in the prior art is single in function and only can be used for the infant to eat. On one hand, the waste of resources is caused, on the other hand, the use cost is high, and the customer experience degree is lower. In addition, the dining chair for infants and the chair for adults need to be stored separately, occupy a large amount of storage space, and are inconvenient to store.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects and shortcomings in the prior art, the utility model aims to provide a multifunctional chair, a seat unit and a dining chair unit can be used separately and independently, the seat unit is used by adults, the dining chair unit is used by infants, the seat unit and the dining chair unit can also be combined for use, a dinner plate can be detached from a second seat part, and a chair leg unit is installed on the dinner plate for use; the multifunctional application of the chair is realized, the use cost of the chair is reduced, and the user experience is improved.

In order to achieve the above object, the utility model discloses a multifunctional chair, which comprises a seat unit and a dining chair unit which is detachable from the seat unit, wherein the seat unit comprises a first seat part; the dining chair unit comprises a second seat member detachably connected with the first seat member and a dinner plate detachably connected with the second seat member; also included are leg units that are removably connected to the first seating member or tray.

Preferably, the first seat part is provided with a first sliding groove, and the second seat part is provided with a first sliding strip which is accommodated in the first sliding groove in a sliding manner; the first seat part is provided with a positioning hole, and the second seat part is movably provided with a positioning part inserted into the positioning hole.

Preferably, the second seat member is provided with a second sliding groove and a first clamping hole communicated with the second sliding groove, the length direction of the first sliding groove is crossed with the length direction of the second sliding groove, and the positioning member is provided with a first elastic buckle extending into the first clamping hole.

Preferably, the lower end of the positioning piece is inserted into the positioning hole, and the upper end of the positioning piece is provided with a first pinching plate convenient for a user to grasp; the first elastic buckle is provided with a first clamping protrusion extending into the first clamping hole, the free end of the first elastic buckle is provided with a first protrusion, and a user enables the first clamping protrusion to withdraw from the first clamping hole by pressing the first protrusion.

Preferably, the second seat part is provided with two protection plates, the dinner plate is provided with two third sliding grooves, and the two protection plates are respectively and slidably accommodated in the two third sliding grooves; the dinner plate is provided with a sliding locking bar, the protection plate is provided with a plurality of locking holes, the locking holes are arranged along the sliding direction of the second seat part and the dinner plate, and the locking bar is used for being inserted into one locking hole.

Preferably, the dinner plate is provided with a driving plate in a sliding manner, the sliding direction of the driving plate and the sliding direction of the locking bar are arranged in a crossed manner, the driving plate is provided with an inclined guide groove, and the driving plate is provided with a cylindrical member movably accommodated in the inclined guide groove; the driving plate is provided with a second elastic buckle, and the dinner plate is provided with a second clamping hole for accommodating the second elastic buckle.

Preferably, the dinner plate is provided with an abdicating groove which is concavely arranged from the bottom surface of the dinner plate, and the driving plate is provided with a second pinching plate movably accommodated in the abdicating groove; the second elastic buckle is provided with a second clamping protrusion accommodated in the second clamping hole, the free end of the second elastic buckle is provided with a second protrusion, and a user enables the second clamping protrusion to withdraw from the second clamping hole by pressing the second protrusion.

Preferably, the second seat member is provided with a containing groove and a blocking column positioned in the containing groove, and the blocking column is positioned between the two legs of the user contained in the containing groove; the dinner plate is provided with a blind groove which is formed by recessing from the top surface of the dinner plate; the second seat part is rotatably provided with two supporting legs, the bottom of the second seat part is provided with two containing holes respectively containing the two supporting legs, and the two supporting legs which are rotatably moved out of the two containing holes are in a splayed shape.

Preferably, the leg unit has a first leg and a second leg detachably connected to the first leg, the first leg has the same structure as the second leg, the length of the first leg is less than that of the second leg, and both the first leg and the second leg can be detachably connected to the first seat member or the dinner plate; the first seat part and the dinner plate are provided with inserting columns, the inserting columns are provided with third elastic buckles, the first leg parts and the second leg parts are provided with inserting holes and third clamping holes communicated with the inserting holes, the inserting holes are used for accommodating the inserting columns, and the third clamping holes are used for accommodating the third elastic buckles.

Preferably, the leg unit is provided with a plurality of fourth clamping holes, and the plurality of fourth clamping holes are arranged along the length direction of the leg unit; the chair leg unit is provided with a pedal piece in a sliding way, a bolt movably arranged on the pedal piece and an elastic piece used for driving the bolt to extend into a fourth clamping hole.

The utility model has the advantages that: in actual use, the seat unit and the dining chair unit can be separated and used independently, the seat unit is convenient for adults to use, and the dining chair unit is convenient for infants to use; the two can be combined for use and stored, so that the storage space is greatly reduced; the dinner plate can be detached from the second seat part, and the chair leg unit is arranged on the dinner plate for use; the multifunctional application of the chair is realized, the use cost of the chair is reduced, and the user experience is improved.

Drawings

Fig. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic view of the exploded structure of the present invention;

FIG. 3 is an exploded view of the present invention from another perspective;

fig. 4 is a schematic perspective view of a positioning member and a part of a second seat member of the present invention;

fig. 5 is a schematic perspective view of the locking bar and the driving plate of the present invention;

fig. 6 is a schematic perspective view of the insert post, the first leg portion and the second leg portion of the present invention;

fig. 7 is a schematic perspective view of the first leg, the second leg, the pedal, the plug and the elastic member of the present invention.

The reference numerals include:

1-seat unit 2-dining chair unit 3-first seat element

4-concave groove 5-second seat part 6-dinner plate

7-accommodating groove 8-bumping post 9-chair leg unit

11-first chute 12-first slide bar 13-positioning hole

14-positioning piece 15-second sliding groove 16-first clamping hole

17-first elastic buckle 18-first pinch plate 19-first clamping protrusion

21-protective plate 22-third sliding groove 23-locking bar

24-lock hole 25-drive plate 26-inclined guide groove

27-second elastic buckle 28-abdicating groove 29-second pinching plate

31-second snap projection 32-second projection 33-blind groove

34-supporting foot 35-containing hole 36-first leg part

37-second leg 38-insert column 39-third snap fastener

41-jack 42-third card hole 43-blind hole

44-fourth fastening hole 45-pedal piece 46-bolt

47-elastic member.

Detailed Description

In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and accompanying drawings, which are not intended to limit the present invention.

Referring to fig. 1 to 3, a multifunctional chair of the present invention includes a seat unit 1 and a dining chair unit 2 detachable from the seat unit 1, wherein the seat unit 1 includes a first seat member 3, the first seat member 3 is convenient for an adult to use, and preferably, the first seat member 3 is provided with a recess 4 for accommodating the adult.

The dining chair unit 2 comprises a second seat part 5 detachably connected with the first seat part 3 and a dinner plate 6 detachably connected with the second seat part 5, the second seat part 5 is convenient for infants to use, preferably, the second seat part 5 is provided with a containing groove 7 and a blocking column 8 positioned in the containing groove 7, and the blocking column 8 is positioned between the legs of the infants contained in the containing groove 7; through the arrangement of the blocking column 8, the infant in the accommodating groove 7 is prevented from sliding out of the accommodating groove 7.

And the chair leg unit 9 is detachably connected with the first seat part 3 or the dinner plate 6, and the chair leg unit 9 can be arranged on the first seat part 3 or the dinner plate 6 according to actual requirements.

In actual use, the seat unit 1 and the dining chair unit 2 can be used separately and independently, the seat unit 1 is convenient for adults to use, and the dining chair unit 2 is convenient for infants to use; the two can be combined for use and stored, so that the storage space is greatly reduced; the dinner plate 6 can also be detached from the second seat part 5, and the chair leg unit 9 is arranged on the dinner plate 6 for use; the multifunctional application of the chair is realized, the use cost of the chair is reduced, and the user experience is improved.

The first seat part 3 is provided with a first sliding groove 11, and the second seat part 5 is provided with a first sliding strip 12 which is slidably accommodated in the first sliding groove 11; the first seat member 3 is provided with a positioning hole 13, and the second seat member 5 is movably provided with a positioning member 14 inserted into the positioning hole 13.

The inner hole wall of the positioning hole 13 is used to stop the positioning part 14, so as to prevent the second seat part 5 from moving relative to the first seat part 3. Through the cooperation of the first sliding chute 11 and the first sliding strip 12, the first seat part 3 and the second seat part 5 are quickly and accurately assembled together, so that the positioning part 14 is quickly and accurately inserted into the positioning hole 13.

In this embodiment, the number of the first slide bars 12 is two, and the two first slide bars 12 are respectively located at the left and right sides of the second seat member 5. The number of the first sliding grooves 11 is two, the two first sliding grooves 11 are respectively formed by the concave arrangement of the inner groove walls at the left side and the right side of the concave groove 4, and the two first sliding strips 12 are respectively arranged in the two first sliding grooves 11 in a sliding and accommodating manner.

Referring to fig. 1 to 4, the second seat member 5 is provided with a second sliding groove 15 and a first locking hole 16 communicated with the second sliding groove 15, a length direction of the first sliding groove 11 is crossed with a length direction of the second sliding groove 15, preferably, the length direction of the first sliding groove 11 is perpendicular to the length direction of the second sliding groove 15, the first sliding groove 11 extends along a horizontal direction, and the second sliding groove 15 extends along a vertical direction.

The positioning member 14 is provided with a first elastic buckle 17 extending into the first clamping hole 16, and the inner hole wall of the first clamping hole 16 is utilized to stop and abut against the first elastic buckle 17, so that the positioning member 14 is prevented from moving relative to the second positioning member 5 and withdrawing from the first clamping hole 16.

When the first seat part 3 and the second seat part 5 need to be detached and separated, a user presses the first elastic buckle 17 with fingers, so that the first elastic buckle 17 is withdrawn from the first clamping hole 16, then the positioning part 14 can be pulled, so that the positioning part 14 is withdrawn from the positioning hole 13, and then the second seat part 5 can be slid, so that the second seat part 5 and the first seat part 3 are separated.

The lower end of the positioning member 14 is used for being inserted into the positioning hole 13, and the upper end of the positioning member 14 is provided with a first pinching plate 18 which is convenient for a user to grasp. In actual use, a user can move the positioning member 14 by grasping the first pinching plate 18, so that the convenience of moving the positioning member 14 is improved.

The first elastic buckle 17 is provided with a first clamping protrusion 19 extending into the first clamping hole 16, the free end of the first elastic buckle 17 is provided with a first protrusion, and a user can press the first protrusion to enable the first clamping protrusion 19 to withdraw from the first clamping hole 16, and then can hold the first pinch plate 18 with fingers to move the positioning part 14, so that the positioning part 14 is withdrawn from the positioning hole 13.

The second seat part 5 is provided with two protection plates 21, the accommodating groove 7 is formed between the two protection plates 21, and the two protection plates 21 block the infant in the accommodating groove 7 to prevent the infant from moving left and right in the accommodating groove 7. The lower end of the dinner plate 6 is provided with two third sliding grooves 22, and the two protection plates 21 are respectively accommodated in the two third sliding grooves 22 in a sliding manner; the dinner plate 6 and the second seat part 5 are quickly assembled together through the sliding fit of the first sliding chute 11 and the protection plate 21; the tray 6 is prevented from moving left and right with respect to the second seating part 5 by the inner walls of the third sliding grooves 22 being stopped against the protection plate 21.

The dinner plate 6 is provided with a sliding locking bar 23, the protection plate 21 is provided with a plurality of locking holes 24, the locking holes 24 are arranged along the sliding direction of the second seat part 5 and the dinner plate 6, and the locking bar 23 is inserted into one locking hole 24. The dish 6 is easily moved back and forth according to the desired position of the dish 6 on the second seating member 5, and after the dish 6 is moved to the desired position, the locking bar 23 is inserted into the corresponding one of the locking holes 24, and the locking bar 23 is stopped by the inner wall of the locking hole 24, so that the dish 6 is accurately positioned at the desired position on the second seating member 5, and the dish 6 is prevented from moving relative to the second seating member 5.

Referring to fig. 1 to 5, a driving plate 25 is slidably disposed on the dish 6, a sliding direction of the driving plate 25 is crossed with a sliding direction of the locking bar 23, and preferably, the sliding direction of the driving plate 25 is perpendicular to the sliding direction of the locking bar 23. The driving plate 25 is provided with an inclined guide groove 26, and the driving plate 25 is provided with a column member movably accommodated in the inclined guide groove 26; the longitudinal direction of the inclined guide groove 26 intersects with the sliding direction of the drive plate 25, and the longitudinal direction of the inclined guide groove 26 intersects with the sliding direction of the lock bar 23.

When the locking bar 23 needs to enter or exit the locking hole 24, the user moves the driving plate 25, and by means of the collision effect of the inner groove wall of the inclined guide groove 26 on the locking bar 23, the moving driving plate 25 drives the locking bar 23 to move back and forth, so that the locking bar 23 enters or exits the locking hole 24.

The driving plate 25 is provided with a second elastic buckle 27, and the dinner plate 6 is provided with a second clamping hole for accommodating the second elastic buckle 27. In practical use, the inner hole wall of the second locking hole abuts against and stops the second elastic buckle 27, so that the driving plate 25 is prevented from moving accidentally to drive the locking bar 23 to move. When the locking bar 23 needs to be moved, the user presses the second elastic buckle 27, so that the second elastic buckle 27 is withdrawn from the second clamping hole, then the driving plate 25 can be moved, and the moved driving plate 25 can drive the locking bar 23 to move.

The dinner plate 6 is provided with an abdicating groove 28, the abdicating groove 28 is formed by being concavely arranged on the bottom surface of the dinner plate 6, and the driving plate 25 is provided with a second pinching plate 29 movably accommodated in the abdicating groove 28; in use, the user can easily move the drive plate 25 back and forth by grasping the second pinch plate 29. The provision of the relief groove 28 at the lower end of the tray 6 prevents an infant in the receiving groove 7 from grasping or touching the second pinch plate 29 to move the drive plate 25.

The second elastic buckle 27 is provided with a second clamping protrusion 31 accommodated in the second clamping hole, the free end of the second elastic buckle 27 is provided with a second protrusion 32, the user can press the second protrusion 32 to enable the second clamping protrusion 31 to withdraw from the second clamping hole, and after the second clamping protrusion 31 withdraws from the second clamping hole, the user can hold the second pinch plate 29 to move the drive plate 25.

The dinner plate 6 is provided with a blind groove 33, and the blind groove 33 is formed by recessing from the top surface of the dinner plate 6; in actual use, the dinner plate 6 is used for bearing food or tableware, juice in the food or tableware is easy to spill out, and the juice splashed out by the food or tableware is contained in the blind groove 33, so that the juice is prevented from flowing out of the dinner plate 6 and being badly used.

The second seat part 5 is rotatably provided with two supporting legs 34, the rotating axes of the two supporting legs 34 are arranged in parallel, the bottom of the second seat part 5 is provided with two accommodating holes 35 for accommodating the two supporting legs 34 respectively, the accommodating holes 35 are formed by being concavely arranged on the bottom surface of the second seat part 5, and the two supporting legs 34 which are rotatably moved out of the two accommodating holes 35 are in a splayed shape. When the user's foot 34 is not needed, the foot 34 is sunk into the receiving hole 35. When the supporting feet 34 are needed, the supporting feet 34 are rotated to move out of the accommodating holes 35, so that the two supporting feet 34 are splayed, and then the second seat member 5 can be stably placed on the ground through the two supporting feet 34.

The chair leg unit 9 is provided with a plurality of leg rods which are conical, the opening calibers of the free ends of the leg rods are larger than the opening calibers of the leg rods close to the first seat part 3 (the dinner plate 6), and the first seat part 3 or the dinner plate 6 is stably placed on the bottom surface through the leg rods.

Each leg bar has a first leg 36 and a second leg 37 releasably connectable to the first leg 36, the first and

second legs

36, 37 being insertable together, the first leg 36 being of the same configuration as the second leg 37, the first leg 36 being of a length less than the second leg 37, the first and

second legs

36, 37 being releasably connectable to the first seating member 3 or tray 6. The user may choose to use either the first leg 36 or the second leg 37 depending on the height requirements not being used.

Referring to fig. 1 to 6, the first seating member 3 and the dinner plate 6 are provided with a plug column 38, the plug column 38 is provided with a third elastic buckle 39, the first leg portion 36 and the second leg portion 37 are provided with a plug hole 41 and a third buckle hole 42 communicated with the plug hole 41, the plug hole 41 is used for accommodating the plug column 38, and the third buckle hole 42 is used for accommodating the third elastic buckle 39. The inner wall of the third engaging hole 42 is stopped against the third elastic buckle 39 to prevent the plug 38 from being withdrawn from the insertion hole 41, so as to ensure that the first leg 36 or the second leg 37 is firmly mounted on the first seat member 3 or the dish plate 6. When the first leg portion 36 or the second leg portion 37 needs to be detached, the user presses the third elastic buckle 39 to make the third elastic buckle 39 withdraw from the third clamping hole 42, and then the first leg portion 36 and the second leg portion 37 can be pulled off from the insertion column 38.

Preferably, the first seat member 3 and the dinner plate 6 both have a blind hole 43, the diameter of the blind hole 43 is larger than the outer diameter of the insert pillar 38, the insert pillar 38 is located in the blind hole 43, the leg portion is clamped between the outer surface of the insert pillar 38 and the inner hole wall of the blind hole 43, the inner hole wall of the blind hole 43 is used for shielding and covering the third elastic buckle 39 and the third clamping hole 42, and the third elastic buckle 39 is prevented from being withdrawn from the third clamping hole 42 due to the fact that the external object touches the third elastic buckle 39.

Referring to fig. 1 to 7, the leg unit 9 is provided with a plurality of fourth locking holes 44, and the plurality of fourth locking holes 44 are disposed along the length direction of the leg unit 9; a plurality of fourth card holes 44 may be provided on the first leg portion 36 or/and the second leg portion 37, as desired. The leg unit 9 is slidably provided with a foot rest 45, a latch 46 movably provided on the foot rest 45, and an elastic member 47 for driving the latch 46 to extend into one of the fourth locking holes 44. When a user sits on the first seat member 3, the user can place his or her foot on the foot rest 45.

The pedal 45 slides back and forth along the length direction of the first leg portion 36 or/and the length of the second leg portion 37, when the pedal 45 slides along the leg portion to a desired position, the pin 46 is inserted into a corresponding one of the fourth locking holes 44, and the pin 46 is blocked by the inner wall of the fourth locking hole 44, so as to ensure that the pedal 45 is firmly positioned on the leg portion. Preferably, the latch 46 is slidably disposed on the leg and the resilient member 47 is a spring. When the pedal 45 needs to be moved, the user pulls the latch 46 to make the latch 46 go out of the fourth locking hole 44, and the elastic member 47 is elastically deformed, so that the pedal 45 can be slid along the length direction of the foot; when the pedal 45 slides to a desired position, the elastic member 47 drives the latch 46 to extend into a corresponding one of the fourth locking holes 44 under the elastic force.

The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.

Claims

1. A multifunctional chair is characterized in that: the dining chair comprises a seat unit and a dining chair unit which is detachable from the seat unit, wherein the seat unit comprises a first seat part; the dining chair unit comprises a second seat member detachably connected with the first seat member and a dinner plate detachably connected with the second seat member; also included are leg units that are removably connected to the first seating member or tray.

2. The multifunctional chair according to claim 1, wherein: the first seat part is provided with a first sliding groove, and the second seat part is provided with a first sliding strip which is accommodated in the first sliding groove in a sliding manner; the first seat part is provided with a positioning hole, and the second seat part is movably provided with a positioning part inserted into the positioning hole.

3. The multifunctional chair according to claim 2, wherein: the second seat part is provided with a second sliding groove and a first clamping hole communicated with the second sliding groove, the length direction of the first sliding groove and the length direction of the second sliding groove are arranged in a crossed mode, and the positioning part is provided with a first elastic buckle extending into the first clamping hole.

4. The multifunctional chair according to claim 3, wherein: the lower end of the positioning piece is inserted into the positioning hole, and the upper end of the positioning piece is provided with a first pinching plate convenient for a user to grasp; the first elastic buckle is provided with a first clamping protrusion extending into the first clamping hole, the free end of the first elastic buckle is provided with a first protrusion, and a user enables the first clamping protrusion to withdraw from the first clamping hole by pressing the first protrusion.

5. The multifunctional chair according to claim 1, wherein: the second seat part is provided with two protection plates, the dinner plate is provided with two third sliding grooves, and the two protection plates are respectively accommodated in the two third sliding grooves in a sliding manner; the dinner plate is provided with a sliding locking bar, the protection plate is provided with a plurality of locking holes, the locking holes are arranged along the sliding direction of the second seat part and the dinner plate, and the locking bar is used for being inserted into one locking hole.

6. The multifunctional chair according to claim 5, wherein: the dinner plate is provided with a driving plate in a sliding mode, the sliding direction of the driving plate and the sliding direction of the locking bar are arranged in a crossed mode, the driving plate is provided with an inclined guide groove, and the driving plate is provided with a cylindrical member movably contained in the inclined guide groove; the driving plate is provided with a second elastic buckle, and the dinner plate is provided with a second clamping hole for accommodating the second elastic buckle.

7. The multifunctional chair according to claim 6, wherein: the dinner plate is provided with an abdicating groove which is concavely arranged from the bottom surface of the dinner plate, and the driving plate is provided with a second pinching plate movably accommodated in the abdicating groove; the second elastic buckle is provided with a second clamping protrusion accommodated in the second clamping hole, the free end of the second elastic buckle is provided with a second protrusion, and a user enables the second clamping protrusion to withdraw from the second clamping hole by pressing the second protrusion.

8. The multifunctional chair according to claim 1, wherein: the second seat part is provided with a containing groove and a blocking column positioned in the containing groove, and the blocking column is positioned between the two legs of the user contained in the containing groove; the dinner plate is provided with a blind groove which is formed by recessing from the top surface of the dinner plate; the second seat part is rotatably provided with two supporting legs, the bottom of the second seat part is provided with two containing holes respectively containing the two supporting legs, and the two supporting legs which are rotatably moved out of the two containing holes are in a splayed shape.

9. The multifunctional chair according to claim 1, wherein: the chair leg unit is provided with a first leg part and a second leg part detachably connected with the first leg part, the structure of the first leg part is the same as that of the second leg part, the length of the first leg part is smaller than that of the second leg part, and the first leg part and the second leg part can be detachably connected with the first seat part or the dinner plate; the first seat part and the dinner plate are provided with inserting columns, the inserting columns are provided with third elastic buckles, the first leg parts and the second leg parts are provided with inserting holes and third clamping holes communicated with the inserting holes, the inserting holes are used for accommodating the inserting columns, and the third clamping holes are used for accommodating the third elastic buckles.

10. The multifunctional chair according to claim 1, wherein: the chair leg unit is provided with a plurality of fourth clamping holes, and the fourth clamping holes are arranged along the length direction of the chair leg unit; the chair leg unit is provided with a pedal piece in a sliding way, a bolt movably arranged on the pedal piece and an elastic piece used for driving the bolt to extend into a fourth clamping hole.