CN112576604A

CN112576604A - Bolt and nut assembly

Info

Publication number: CN112576604A
Application number: CN202110074758.XA
Authority: CN
Inventors: 周春花
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-01-20
Filing date: 2021-01-20
Publication date: 2021-03-30

Abstract

The invention discloses a bolt and nut assembly which comprises a bolt head and a fixing block, wherein the side of the bolt head is fixedly connected with an anti-slip pad, anti-slip grains are arranged on the side of the anti-slip pad, and a rod body is fixedly arranged at the end part of the bolt head. This bolt and nut subassembly, the arc fixture block pops out from spacing hole after the bolt finishes with the nut with the connector is fixed, with this avoid the nut body to take place the wrong groove and slide, the kelly drives the slip disc through spacing spring and goes into to block and take place to rotate with this in the second draw-in groove after that, make this bolt and nut subassembly live time overlength or be difficult for causing nut and bolt to take place not hard up or the wrong groove slides when receiving the striking yet, and then very big has avoided the connector to take place to rock and collapse even, the security in the use has been increased to a certain extent, use for the user brings some facilities, slipmat through setting up, anti-skidding line and metal gasket, make the difficult emergence of being connected between bolt and nut and the connector slide.

Description

Bolt and nut assembly

Technical Field

The invention relates to the technical field of bolts and nuts, in particular to a bolt and nut assembly.

Background

The bolt is a mechanical part, it is the cylindrical threaded fastener of adapted nut, a kind of fastener that comprises head and screw rod (the cylinder that has the external screw thread) two parts, need to cooperate with the nut, be used for the fastening connection two parts that have the through-hole, this kind of connection form is called bolted connection, if screw nut from the bolt, can make these two parts separate again, so bolted connection belongs to and can dismantle the connection, because the convenient and fixed effect of being connected between bolt and the nut is comparatively good and the cost is lower, and then the subassembly application range who constitutes by bolt and nut in people's daily use is very extensive, but current bolt and nut subassembly still has certain defect, just for example:

1. the existing bolt and nut assembly is generally too long in service time or the nut is easy to loosen with the bolt when being impacted or the nut and the thread on the bolt are staggered, so that the connection object is easy to shake or even collapse, potential safety hazards in use are caused, and further inconvenience is brought to the operation of a user;

2. the existing bolt and nut assembly generally does not have a protection effect, because the bolt is exposed in the air for a long time, the bolt is easy to rust for a long time, or the bolt is corroded by the air to break, so that danger is caused, and because the rust on the bolt is very inconvenient for workers to disassemble and replace, certain use defects exist;

3. the protection of general people of current bolt and nut subassembly is all direct at a protective housing of bolt external fixation, and is very inconvenient to the dismantlement in bolt later stage to cause the damage easily when fixed protective housing is dismantled and generally can not carry out used repeatedly, and then increase user's use cost easily.

Aiming at the problems, innovative design is urgently needed on the basis of the original bolt and nut component structure.

Disclosure of Invention

The invention aims to provide a bolt and nut assembly to solve the problems that the prior art has long service life or the nut is easy to loosen with a bolt when being impacted, or the screw thread on the nut and the bolt is staggered, so that the connecting object is easy to shake or collapse, the potential safety hazard in use is caused, the protective effect is not achieved, because the bolt is exposed in the air for a long time, the bolt is easy to rust for a long time or is corroded by the air to cause the bolt to break, which causes danger, moreover, because the rust workers on the bolts are very inconvenient to disassemble and replace, a protective shell is directly fixed outside the bolts for protection, the dismantlement to the bolt later stage is very inconvenient to cause the damage when fixed protective housing is dismantled and generally can not carry out used repeatedly easily, and then increase user's use cost's problem easily.

In order to achieve the purpose, the invention provides the following technical scheme: a bolt and nut assembly comprises a bolt head and a fixed block, wherein an anti-slip pad is fixedly connected to the side of the bolt head, anti-slip patterns are arranged on the side of the anti-slip pad, a rod body is fixedly arranged at the end of the bolt head, a metal gasket is movably connected to the outer wall of the rod body, a rubber gasket is movably arranged at the end of the metal gasket, a nut body is movably arranged on the outer wall of the rod body, a barrel body is fixedly connected to the end of the nut body, a limiting hole is formed in the top of the barrel body, an arc-shaped clamping block is movably connected to the inner wall of the limiting hole, a first sliding groove is formed in the outer wall of the barrel body, a first arc-shaped sliding block is movably arranged on the inner wall of the first sliding groove, a protection plate is fixedly connected to the end of the first arc-shaped sliding block, a first clamping groove is formed, and the inner wall swing joint of second spout has second arc slider to the top fixedly connected with slip disc of second arc slider, and the tip fixed mounting of slip disc has the dead lever moreover to the end fixing of dead lever has the haulage rope, the mounting hole has been seted up to the tip of staving, the spacing spring of tip fixedly connected with of slip disc, the second draw-in groove has been seted up to the avris of fixed block, and the inner wall swing joint of second draw-in groove has the kelly, the mounting groove has been seted up at the top of fixed block, and the top fixed mounting of mounting groove has buffer spring to buffer spring's the stable piece of tip fixedly connected with, the top of fixed block is fixed with the limiting plate.

Preferably, the tip of nut body and the avris fixed connection of special-shaped fixture block, and the quantity of special-shaped fixture block is 4 to 4 special-shaped fixture blocks are the setting of annular equidistance at the avris of nut body, and special-shaped fixture block constitutes the block structure through first draw-in groove and guard plate moreover, and the external dimension of special-shaped fixture block is identical completely with the internal dimension of first draw-in groove.

Preferably, the number of the limiting holes is 20, and each 10 of the 20 limiting holes is 1 group, and the 2 groups of limiting holes are symmetrically arranged by taking the perpendicular bisector of the barrel body as a symmetry axis.

Preferably, the inside of guard plate contains corrosion-resistant layer, waterproof layer and dampproof course, and the bottom fixedly connected with waterproof layer on corrosion-resistant layer to the bottom fixed mounting of waterproof layer has the dampproof course, and corrosion-resistant layer passes through the waterproof layer and constitutes the integral structure with the dampproof course moreover.

Preferably, the side of the sliding disc is fixedly connected with the end part of the limiting spring, and the sliding disc and the barrel body form an elastic structure through the limiting spring.

Preferably, the end of the fixed rod is fixedly connected with the side of the sliding disc, and the fixed rod and the clamping rod form an integrated structure through the sliding disc.

Preferably, the end part of the first arc-shaped sliding block is fixedly connected with the inner wall of the protection plate, the first arc-shaped sliding block forms a sliding structure with the barrel body through a first sliding groove, and the side edge of the first arc-shaped sliding block is attached to the inner surface of the barrel body.

Preferably, the quantity of buffer spring is 2, and 2 buffer spring use the perpendicular bisector of fixed block as symmetry axis symmetry setting to the fixed block passes through buffer spring and constitutes elastic structure with the stabilizing block.

Preferably, the kelly passes through the second draw-in groove and constitutes the block structure with the fixed block, and the external dimension of kelly is identical completely with the internal dimension of second draw-in groove to the quantity of second draw-in groove is 8, and 8 second draw-in grooves are the avris of seting up at the fixed block of annular equidistance.

Preferably, the top of the second arc-shaped sliding block is fixedly connected with the bottom of the sliding disc, the second arc-shaped sliding block forms a sliding structure with the barrel body through a second sliding groove, and the bottom of the second arc-shaped sliding block is attached to the inner surface of the barrel body.

Compared with the prior art, the invention has the beneficial effects that: the bolt and nut assembly;

1. the limiting and fixing structure is provided with a buffer spring, a stabilizing block and an arc-shaped clamping block, the arc-shaped clamping block is popped out from a limiting hole after the bolt and the nut fix the connecting object, so that the nut body is prevented from sliding in a staggered way, then a clamping rod drives a sliding disc to be clamped into a second clamping groove through the limiting spring so as to prevent the nut body from rotating, so that the bolt and nut assembly is not easy to loosen or slide in a staggered way when the bolt and nut assembly is too long in service time or is impacted, further, the connecting object is greatly prevented from shaking or even collapsing, the safety in use is increased to a certain extent, convenience is brought to the use of a user, and the bolt, the nut and the connecting object are prevented from sliding easily through the arranged anti-slip pad, anti-slip threads and metal gasket;

2. the protective structure is provided with the corrosion-resistant layer, the waterproof layer and the moisture-proof layer, the bolt is not easy to corrode through the arranged corrosion-resistant layer, the bolt is not easy to be affected by water vapor through the arranged waterproof layer and the moisture-proof layer, the situation that the bolt rusts is greatly avoided, the bolt, the nut and a connecting object are connected through the arranged rubber washer, the bolt deforms through force extrusion when being connected, air is completely isolated out of the bolt, the situation that the bolt rusts due to the fact that the bolt is exposed in the air for a long time or the bolt is broken due to air corrosion to cause danger is greatly avoided, and the service life of the bolt is prolonged;

3. be provided with the sliding structure that first spout and first slider constitute, it pushes the guard plate to the nut body through the slip of first slider in first spout to grasp the guard plate, block through between dysmorphism fixture block and the special-shaped draw-in groove will make the guard plate fix the avris at the nut body after that, make the workman become very simple to the installation of guard plate, and if need only need pull the guard plate when dismantling the nut body backward alright with separating guard plate and nut body, make the workman also can not damage the guard plate when dismantling the bolt, make the guard plate can carry out repetitious usage, user's use cost has been reduced to a certain extent.

Drawings

FIG. 1 is a schematic cross-sectional structural view of the present invention;

FIG. 2 is a side cross-sectional structural schematic view of the present invention;

FIG. 3 is an enlarged view of the structure at A in FIG. 1 according to the present invention;

FIG. 4 is an enlarged view of the structure at B in FIG. 1 according to the present invention;

FIG. 5 is a side cross-sectional structural view of a fixing block of the present invention;

FIG. 6 is a schematic view of the connection between the barrel and the sliding disk structure according to the present invention;

fig. 7 is a front cross-sectional structural schematic view of the guard plate of the present invention.

In the figure: 1. a bolt head; 2. a non-slip mat; 3. anti-skid lines; 4. a rod body; 5. a metal gasket; 6. a rubber gasket; 7. a nut body; 8. a special-shaped fixture block; 9. a barrel body; 10. a limiting hole; 11. a protection plate; 111. a corrosion-resistant layer; 112. a waterproof layer; 113. a moisture barrier; 12. a first card slot; 13. a sliding disk; 14. a limiting spring; 15. mounting holes; 16. fixing the rod; 17. a hauling rope; 18. a first chute; 19. a first arc-shaped sliding block; 20. a fixed block; 21. a limiting plate; 22. a buffer spring; 23. a stabilizing block; 24. an arc-shaped fixture block; 25. mounting grooves; 26. a second card slot; 27. a clamping rod; 28. a second chute; 29. and the second arc-shaped sliding block.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-7, the present invention provides a technical solution: a bolt and nut assembly comprises a bolt head 1, an anti-skid pad 2, anti-skid threads 3, a rod body 4, a metal gasket 5, a rubber gasket 6, a nut body 7, a special-shaped fixture block 8, a barrel body 9, a limiting hole 10, a protective plate 11, an anti-corrosion layer 111, a waterproof layer 112, a damp-proof layer 113, a first clamping groove 12, a sliding disc 13, a limiting spring 14, a mounting hole 15, a fixing rod 16, a traction rope 17, a first sliding groove 18, a first arc-shaped sliding block 19, a fixing block 20, a limiting plate 21, a buffer spring 22, a stabilizing block 23, an arc-shaped fixture block 24, a mounting groove 25, a second clamping groove 26, a clamping rod 27, a second sliding groove 28 and a second arc-shaped sliding block 29, wherein the anti-skid pad 2 is fixedly connected to the side of the bolt head 1, the anti-skid threads 3 are arranged on the side of the anti-skid pad 2, the rod body 4 is fixedly arranged at the end part of the bolt head, the outer wall of the rod body 4 is movably provided with a nut body 7, the end part of the nut body 7 is fixedly connected with a barrel body 9, the top of the barrel body 9 is provided with a limiting hole 10, the inner wall of the limiting hole 10 is movably connected with an arc-shaped clamping block 24, the outer wall of the barrel body 9 is provided with a first sliding chute 18, the inner wall of the first sliding chute 18 is movably provided with a first arc-shaped sliding block 19, the end part of the first arc-shaped sliding block 19 is fixedly connected with a protection plate 11, the end part of the protection plate 11 is provided with a first clamping groove 12, the inner wall of the first clamping groove 12 is movably provided with a special-shaped clamping block 8, the inner wall of the barrel body 9 is provided with a second sliding chute 28, the inner wall of the second sliding chute 28 is movably connected with a second arc-shaped sliding block 29, the top of the second arc-shaped sliding block 29, mounting hole 15 has been seted up to the tip of staving 9, the spacing spring 14 of tip fixedly connected with of slip disc 13, second draw-in groove 26 has been seted up to the avris of fixed block 20, and the inner wall swing joint of second draw-in groove 26 has a kelly 27, mounting groove 25 has been seted up at the top of fixed block 20, and the top fixed mounting of mounting groove 25 has buffer spring 22, and buffer spring 22's tip fixedly connected with stabilizing block 23, fixed block 20's top is fixed with limiting plate 21.

The end part of the nut body 7 is fixedly connected with the edge side of the special-shaped fixture block 8, the number of the special-shaped fixture blocks 8 is 4, the 4 special-shaped fixture blocks 8 are annularly and equidistantly arranged on the edge side of the nut body 7, the special-shaped fixture blocks 8 and the protection plate 11 form a clamping structure through the first clamping grooves 12, the external dimension of the special-shaped fixture blocks 8 is completely matched with the internal dimension of the first clamping grooves 12, and the nut body 7 is more conveniently connected with the protection plate 11 through the special-shaped fixture blocks 8 and the protection plate 11 which are arranged into the clamping structure, and the fixing effect is firmer;

the number of the limiting holes 10 is 20, each 10 of the 20 limiting holes 10 is 1 group, the 2 groups of limiting holes 10 are symmetrically arranged by taking a perpendicular bisector of the barrel body 9 as a symmetry axis, and the limiting holes 10 which are vertically symmetrical are arranged, so that the effect that the barrel body 9 supports the nut body 7 and cannot slide is better;

the interior of the protection plate 11 comprises the corrosion-resistant layer 111, the waterproof layer 112 and the moisture-proof layer 113, the waterproof layer 112 is fixedly connected to the bottom of the corrosion-resistant layer 111, the moisture-proof layer 113 is fixedly mounted at the bottom of the waterproof layer 112, the corrosion-resistant layer 111 and the moisture-proof layer 113 form an integrated structure through the waterproof layer 112, and the protection effect of the protection plate 11 on the rod body 4 is better through the corrosion-resistant layer 111 and the moisture-proof layer 113 which are arranged into the integrated structure;

the side of the sliding disc 13 is fixedly connected with the end part of the limiting spring 14, the sliding disc 13 and the barrel body 9 form an elastic structure through the limiting spring 14, and the clamping rod 27 is conveniently clamped into the second clamping groove 26 through the sliding disc 13 and the barrel body 9 which are arranged into the elastic structure;

the end part of the fixed rod 16 is fixedly connected with the side of the sliding disc 13, the fixed rod 16 and the clamping rod 27 form an integrated structure through the sliding disc 13, and the clamping rod 27 is not easy to fall off when the fixed rod 16 is pulled by the traction rope 17 through the fixed rod 16 and the clamping rod 27 which are arranged into the integrated structure;

the end part of the first arc-shaped sliding block 19 is fixedly connected with the inner wall of the protection plate 11, the first arc-shaped sliding block 19 and the barrel body 9 form a sliding structure through the first sliding groove 18, the side of the first arc-shaped sliding block 19 is attached to the inner surface of the barrel body 9, and the protection plate 11 is convenient to mount and dismount through the first arc-shaped sliding block 19 and the barrel body 9 which are arranged into the sliding structure;

the number of the buffer springs 22 is 2, the 2 buffer springs 22 are symmetrically arranged by taking the perpendicular bisector of the fixed block 20 as a symmetry axis, the fixed block 20 and the stabilizing block 23 form an elastic structure through the buffer springs 22, and the arc-shaped fixture block 24 can automatically bounce to limit the barrel body 9 through the fixed block 20 and the stabilizing block 23 which are arranged into the elastic structure;

the clamping rod 27 and the fixed block 20 form a clamping structure through the second clamping groove 26, the external size of the clamping rod 27 is completely matched with the internal size of the second clamping groove 26, the number of the second clamping grooves 26 is 8, the 8 second clamping grooves 26 are annularly and equidistantly arranged on the side of the fixed block 20, and the rod body 4 and the nut body 7 cannot rotate through the clamping rod 27 and the fixed block 20 which are arranged into the clamping structure;

the top of the second arc-shaped sliding block 29 is fixedly connected with the bottom of the sliding disk 13, the second arc-shaped sliding block 29 and the barrel body 9 form a sliding structure through the second sliding chute 28, the bottom of the second arc-shaped sliding block 29 is attached to the inner surface of the barrel body 9, and the sliding disk 13 is convenient to move through the second arc-shaped sliding block 29 and the barrel body 9 which are arranged into the sliding structure.

The working principle is as follows: in use of the bolt and nut assembly, according to fig. 1, 3, 4 and 5, a metal washer 5 and a rubber washer 6 are put on the rod body 4, then the rod body 4 penetrates through an object to be installed, another group of rubber washers 6 and metal gaskets 5 are sleeved on the rod body 4, the nut body 7 is taken up and rotated to be connected with the upper rod body 4, the traction rope 17 is pulled to enable the fixing rod 16 to move in the installation hole 15 to pull the clamping rod 27 open, then the arc-shaped clamping block 24 is pressed into the barrel body 9, when the nut body 7 is attached to the other side of the object, the traction rope 17 is loosened, the sliding disc 13 is pushed by the limiting spring 14, the sliding disc 13 pushes the clamping rod 27 into the second clamping groove 26 at the side of the fixed block 20 by sliding the second arc-shaped sliding block 29 in the second sliding groove 28, then the arc-shaped clamping block 24 pushes the stabilizing block 23 to be clamped into the limiting hole 10 through the buffer spring 22 in the mounting groove 25;

according to fig. 1, 2 and 6, after the rod body 4 and the nut body 7 are fixed, the protection plate 11 is pushed, the protection plate 11 slides in the first sliding groove 18 through the first arc-shaped sliding block 19 to be connected with the nut body 7, and finally the protection plate 11 is clamped in the first clamping groove 12 through the special-shaped clamping block 8 to limit and fix the protection plate 11, so that the rod body 4 exposed outside is protected;

according to fig. 1 and 7, when the rod body 4 and the nut body 7 are fixed, the bolt head 1 rubs against the metal gasket 5 through the anti-slip threads 3 on the side of the anti-slip mat 2 to limit and fix the rod body 4, the nut body 7 rubs against the metal gasket 5 to limit and fix the metal gasket 5, the rubber gasket 6 deforms through force extrusion to attach and protect the joint, and the exposed rod body 4 is attached and protected through the corrosion-resistant layer 111, the waterproof layer 112 and the moisture-proof layer 113, so that the service life of the bolt-nut assembly is further prolonged.

Those not described in detail in this specification are within the skill of the art.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a bolt nut subassembly, includes bolt head (1) and fixed block (20), its characterized in that: the anti-skidding bolt is characterized in that an anti-skidding cushion (2) is fixedly connected to the side of the bolt head (1), anti-skidding patterns (3) are formed in the side of the anti-skidding cushion (2), a rod body (4) is fixedly mounted at the end of the bolt head (1), a metal gasket (5) is movably connected to the outer wall of the rod body (4), a rubber gasket (6) is movably mounted at the end of the metal gasket (5), a nut body (7) is movably arranged on the outer wall of the rod body (4), a barrel body (9) is fixedly connected to the end of the nut body (7), a limiting hole (10) is formed in the top of the barrel body (9), an arc-shaped clamping block (24) is movably connected to the inner wall of the limiting hole (10), a first sliding groove (18) is formed in the outer wall of the barrel body (9), a first arc-shaped sliding block (19) is movably mounted on the inner wall of the, and the end of the protection plate (11) is provided with a first clamping groove (12), the inner wall of the first clamping groove (12) is movably provided with a special-shaped clamping block (8), the inner wall of the barrel body (9) is provided with a second sliding groove (28), the inner wall of the second sliding groove (28) is movably connected with a second arc-shaped sliding block (29), the top of the second arc-shaped sliding block (29) is fixedly connected with a sliding disc (13), the end of the sliding disc (13) is fixedly provided with a fixing rod (16), the end of the fixing rod (16) is fixedly provided with a traction rope (17), the end of the barrel body (9) is provided with a mounting hole (15), the end of the sliding disc (13) is fixedly connected with a limiting spring (14), the side of the fixing block (20) is provided with a second clamping groove (26), the inner wall of the second clamping groove (26) is movably connected with a clamping rod (27), the, and the top fixed mounting of mounting groove (25) has buffer spring (22) to the tip fixedly connected with stabilizing block (23) of buffer spring (22), the top of fixed block (20) is fixed with limiting plate (21).

2. A bolt and nut assembly according to claim 1 wherein: the avris fixed connection of the tip of nut body (7) and special-shaped fixture block (8), and the quantity of special-shaped fixture block (8) is 4 to 4 special-shaped fixture blocks (8) are the avris of the equidistant setting in nut body (7) of annular, and special-shaped fixture block (8) constitute the block structure through first draw-in groove (12) and guard plate (11) moreover, and the external dimension of special-shaped fixture block (8) is identical completely with the internal dimension of first draw-in groove (12).

3. A bolt and nut assembly according to claim 1 wherein: the quantity of spacing hole (10) is 20, and 20 spacing hole (10) every 10 be 1 group to 2 sets of spacing hole (10) use the perpendicular bisector of staving (9) to set up as symmetry axis symmetry.

4. A bolt and nut assembly according to claim 1 wherein: the protection plate (11) comprises an anti-corrosion layer (111), a waterproof layer (112) and a moisture-proof layer (113) inside, the waterproof layer (112) is fixedly connected to the bottom of the anti-corrosion layer (111), the moisture-proof layer (113) is fixedly mounted at the bottom of the waterproof layer (112), and the anti-corrosion layer (111) and the moisture-proof layer (113) form an integrated structure through the waterproof layer (112).

5. A bolt and nut assembly according to claim 1 wherein: the side of the sliding disc (13) is fixedly connected with the end part of the limiting spring (14), and the sliding disc (13) and the barrel body (9) form an elastic structure through the limiting spring (14).

6. A bolt and nut assembly according to claim 1 wherein: the end part of the fixed rod (16) is fixedly connected with the side of the sliding disc (13), and the fixed rod (16) and the clamping rod (27) form an integrated structure through the sliding disc (13).

7. A bolt and nut assembly according to claim 1 wherein: the end part of the first arc-shaped sliding block (19) is fixedly connected with the inner wall of the protection plate (11), the first arc-shaped sliding block (19) forms a sliding structure with the barrel body (9) through a first sliding groove (18), and the side edge of the first arc-shaped sliding block (19) is attached to the inner surface of the barrel body (9).

8. A bolt and nut assembly according to claim 1 wherein: the quantity of buffer spring (22) is 2, and 2 buffer spring (22) use the perpendicular bisector of fixed block (20) to set up as symmetry axis symmetry to fixed block (20) constitute elastic construction through buffer spring (22) and steady piece (23).

9. A bolt and nut assembly according to claim 1 wherein: the clamping rod (27) and the fixing block (20) form a clamping structure through the second clamping groove (26), the external size of the clamping rod (27) is completely matched with the internal size of the second clamping groove (26), the number of the second clamping grooves (26) is 8, and the 8 second clamping grooves (26) are annularly arranged on the edge side of the fixing block (20) at equal intervals.

10. A bolt and nut assembly according to claim 1 wherein: the top of the second arc-shaped sliding block (29) is fixedly connected with the bottom of the sliding disc (13), the second arc-shaped sliding block (29) forms a sliding structure with the barrel body (9) through a second sliding groove (28), and the bottom of the second arc-shaped sliding block (29) is attached to the inner surface of the barrel body (9).