Side inclined core-pulling mechanism of plastic chair injection mold

Abstract

The utility model belongs to the technical field of molds, and particularly relates to a side inclined core-pulling mechanism of a plastic chair injection mold. The plastic chair body forming die comprises a plastic chair body forming lower die and a plastic chair body forming upper die. In the injection molding process, the plastic chair body molding lower mold and the plastic chair body molding upper mold are close to each other, so that the chair body molding bulge and the chair body molding concave cavity are attached to form a complete cavity, and a molten material is injected into the cavity through the injection molding main plate; the side core-pulling structure and the end core-pulling structure are used for synchronously forming the side hole position structure and the end hole position structure of the plastic part, secondary punching treatment is not needed, the working procedure is shortened, after injection molding is completed, the side core-pulling structure and the end core-pulling structure are firstly driven by the oblique sliding driving mechanism to be pulled away from one end of the plastic part, and the oblique sliding driving mechanism drives the end core-pulling structure to be pulled away from the other end of the plastic part. The side core-pulling structure and the end core-pulling structure are driven to perform horizontal core-pulling under the action of up-down sliding and an inclined surface, so that the transverse occupied space of the mold can be greatly reduced, and meanwhile, the core-pulling distance can be more accurately controlled.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds and relates to a side oblique core-pulling mechanism of an injection mold for a plastic chair. Background Art

[0002] The plastic chair body is injection molded using an injection mold. Since the plastic chair body and chair legs are generally fixed together by connectors, connection holes and grooves need to be reserved on the bottom side and end faces of the plastic chair body to facilitate subsequent assembly. During the injection molding process, existing plastic chair molds have difficulty in simultaneously molding the side and end hole structures of the plastic part, requiring secondary punching, which involves many steps. In addition, the core pulling is generally driven horizontally, which requires a large lateral footprint of the mold and is not conducive to accurately controlling the core pulling distance. Therefore, it is urgently necessary to design a side oblique core pulling mechanism for the plastic chair injection mold that can overcome the above defects.

[0003] In order to overcome the shortcomings of the existing technology, people have proposed various solutions through continuous exploration. For example, a Chinese patent discloses an interchangeable multi-purpose injection mold for processing plastic chairs [application number: 201310162873.8], which includes a fixed mold plate and a movable mold plate, a fixed mold under the fixed mold plate, a movable mold and a guide column on the movable mold plate, fixed blocks on both sides of the movable mold, a cavity on the movable mold, an injection-molded plastic chair between the cavity and the fixed mold, and lifting cylinders on both sides of the cavity. The piston rod is connected to the fixed block, and there is an ejector plate in front of the cavity, an ejector rod is installed on one side of the ejector plate, and an ejector bracket is installed on the other side of the ejector plate. An ejector cylinder is installed on the ejector bracket, and the piston rod of the ejector cylinder is connected to the cavity. The ejector rod is driven by the ejector cylinder, and the head of the ejector rod is in contact with the injection-molded plastic chair. The movable mold is located at the chair back position with a chair back insert, and blocking blocks are set at the chair armrest positions on both sides of the movable mold. The blocking blocks are driven by the piston rod of the blocking block cylinder, and the blocking blocks cooperate with the glue inlet at the movable mold armrest. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems and provide a side oblique core-pulling mechanism for an injection mold of a plastic chair.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A side oblique core-pulling mechanism of a plastic chair injection mold comprises a plastic chair body molding lower mold and a plastic chair body molding upper mold, an injection molding main board is provided above the plastic chair body molding upper mold, a chair body molding protrusion is provided on the plastic chair body molding lower mold, a chair body molding cavity is provided in the plastic chair body molding upper mold, the chair body molding protrusion corresponds to the position of the chair body molding cavity and the shape is adapted thereto, a straight top piece is provided below the plastic chair body molding lower mold which passes through the plastic chair body molding lower mold and the chair body molding protrusion in sequence, a side core-pulling structure and an end core-pulling structure which can perform reciprocating linear motion along one end close to or away from the chair body molding protrusion are provided in the plastic chair body molding upper mold, and an oblique sliding drive mechanism for driving the side core-pulling structure and the end core-pulling structure to move horizontally is provided on the outside of the plastic chair body molding upper mold.

[0007] In the above-mentioned side oblique core-pulling mechanism of the plastic chair injection mold, a side groove molding concave portion and an end groove molding concave portion are provided in the chair body molding protrusion, and a side groove molding convex portion and an end groove molding convex portion are provided in the chair body molding cavity. The side groove molding concave portion corresponds to the position of the side groove molding convex portion and the shape is matched, and the end groove molding concave portion corresponds to the position of the end groove molding convex portion and the shape is matched.

[0008] In the above-mentioned side oblique core-pulling mechanism of the plastic chair injection mold, the side core-pulling structure passes through the side groove forming convex portion, and the end core-pulling structure passes through the end groove forming convex portion.

[0009] In the above-mentioned side oblique core pulling mechanism of the plastic chair injection mold, the side core pulling structure includes several side straight core pulling rods arranged in the plastic chair body molding upper mold. When the mold is closed, the heads of the side straight core pulling rods extend into the side groove molding concave part.

[0010] In the above-mentioned side oblique core pulling mechanism of the plastic chair injection mold, the head of the side straight core pulling rod is provided with a side hole forming convex shaft body, and the diameter of the side hole forming convex shaft body is smaller than the diameter of the side straight core pulling rod.

[0011] In the above-mentioned side oblique core pulling mechanism of the plastic chair injection mold, the end core pulling structure includes several end straight core pulling rods arranged in the plastic chair body molding upper mold. When the mold is closed, the heads of the end straight core pulling rods extend into the end groove molding concave portion.

[0012] In the above-mentioned side oblique core-pulling mechanism of the plastic chair injection mold, the head of the end straight core-pulling rod is provided with an end hole forming convex shaft body, and the diameter of the end hole forming convex shaft body is smaller than the diameter of the end straight core-pulling rod.

[0013] In the above-mentioned side oblique core-pulling mechanism of the plastic chair injection mold, the oblique sliding drive mechanism includes an end fixing seat and two side fixing seats arranged on the outside of the plastic chair body molding upper mold, the end fixing seat is provided with an end inner slide that can move back and forth linearly up and down, the end straight core-pulling rod is slidably matched with the end inner slide, the side fixing seat is provided with a side inner slide that can move back and forth linearly up and down, the side straight core-pulling rod is slidably matched with the side inner slide.

[0014] In the side inclined core pulling mechanism of the above-mentioned plastic chair injection mold, a first inclined slide is provided in the end inner slide, a second inclined slide is provided in the side inner slide, and an oil cylinder for driving the end inner slide and the side inner slide to slide up and down is provided on the outside of the plastic chair body molding upper mold.

[0015] In the above-mentioned side oblique core-pulling mechanism of the plastic chair injection mold, the straight ejector includes a straight ejector plate arranged below the plastic chair body molding lower mold, and a plurality of straight ejector rods are provided on the straight ejector plate, and the side straight core-pulling rods and the end straight core-pulling rods are respectively staggered with the straight ejector rods.

[0016] Compared with the existing technology, the advantages of this utility model are:

[0017] 1. During the injection molding process, the utility model brings the plastic chair body molding lower mold and the plastic chair body molding upper mold close to each other, so that the chair body molding protrusion fits with the chair body molding cavity to form a complete cavity, and the molten material is injected into the cavity through the injection molding main board, and the side core pulling structure and the end core pulling structure are used to synchronously mold the side and end hole structures of the plastic part, without the need for secondary punching, shortening the process. After the injection molding is completed, the side core pulling structure and the end core pulling structure are first driven by the inclined sliding drive mechanism to be pulled away from one end of the plastic part, and the side core pulling structure and the end core pulling structure are driven by the up and down sliding and the effect of the inclined surface to perform horizontal core pulling, which can greatly reduce the lateral space occupied by the mold and at the same time can more accurately control the core pulling distance.

[0018] 2. During the injection molding process of the utility model, the end hole forming convex shaft body of the end straight core pulling rod extends into the end groove forming concave portion to synchronously mold the end hole groove structure of the plastic part. The diameter of the end hole forming convex shaft body is smaller than the diameter of the end straight core pulling rod. There will be no jamming when the core is pulled out of the mold, and the core pulling is smooth and reasonable.

[0019] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the present utility model.

[0021] Figure 2 It is a partial structural diagram of the utility model.

[0022] Figure 3 It is a partial structural diagram of the utility model in another direction.

[0023] Figure 4 It is a structural diagram of the upper mold for forming a plastic chair body.

[0024] In the figure: plastic chair body molding lower mold 1, plastic chair body molding upper mold 2, injection molding main board 3, chair body molding protrusion 4, chair body molding cavity 5, straight top piece 6, side core pulling structure 7, end core pulling structure 8, inclined sliding drive mechanism 9, side groove molding concave part 10, end groove molding concave part 11, side groove molding convex part 12, side straight core pulling rod 13, side hole molding convex shaft body 14, end straight core pulling rod 15, end hole molding convex shaft body 16, end fixing seat 17, side fixing seat 18, end inner slide 19, side inner slide 20, first inclined slide 21, second inclined slide 22, cylinder 23, straight top plate 24, straight top rod 25. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] like Figure 1-4 As shown, a side oblique core-pulling mechanism of a plastic chair injection mold includes a plastic chair body molding lower mold 1 and a plastic chair body molding upper mold 2, an injection molding mainboard 3 is provided above the plastic chair body molding upper mold 2, a chair body molding protrusion 4 is provided on the plastic chair body molding lower mold 1, a chair body molding cavity 5 is provided in the plastic chair body molding upper mold 2, the chair body molding protrusion 4 corresponds to the position of the chair body molding cavity 5 and the shape is adapted thereto, a straight top piece 6 is provided below the plastic chair body molding lower mold 1 which passes through the plastic chair body molding lower mold 1 and the chair body molding protrusion 4 in sequence, a side core-pulling structure 7 and an end core-pulling structure 8 which can make reciprocating linear motion along one end close to or away from the chair body molding protrusion 4 are provided in the plastic chair body molding upper mold 2, and an oblique sliding drive mechanism 9 is provided on the outside of the plastic chair body molding upper mold 2 for driving the side core-pulling structure 7 and the end core-pulling structure 8 to move horizontally.

[0027] In this embodiment, during the injection molding process, the plastic chair body molding lower mold 1 and the plastic chair body molding upper mold 2 are brought close to each other, so that the chair body molding protrusion 4 and the chair body molding cavity 5 are fitted together to form a complete cavity, and the molten material is injected into the cavity through the injection molding main board 3, and the side core pulling structure 7 and the end core pulling structure 8 are used to synchronously mold the side and end hole structures of the plastic part. There is no need for secondary punching processing, which shortens the process. After the injection molding is completed, the side core pulling structure 7 and the end core pulling structure 8 are first driven by the inclined sliding drive mechanism 9 to be pulled away from one end of the plastic part, and the side core pulling structure 7 and the end core pulling structure 8 are driven to perform horizontal core pulling by sliding up and down and the action of the inclined surface, which can greatly reduce the lateral space occupied by the mold and at the same time can more accurately control the core pulling distance.

[0028] Combine Figure 1-4 As shown, the chair body molding protrusion 4 is provided with a side groove molding concave portion 10 and an end groove molding concave portion 11, and the chair body molding cavity 5 is provided with a side groove molding convex portion 12 and an end groove molding convex portion 122. The side groove molding concave portion 10 corresponds to the position of the side groove molding convex portion 12 and the shape is adapted thereto, and the end groove molding concave portion 11 corresponds to the position of the end groove molding convex portion 122 and the shape is adapted thereto.

[0029] Specifically, during the injection molding process, the side groove molding concave portion 10 is opposite to the side groove molding convex portion 12 to form the side groove structure of the plastic part, and the end groove molding concave portion 11 is opposite to the end groove molding convex portion 122 to form the end groove structure of the plastic part, without the need for secondary processing.

[0030] The side core pulling structure 7 passes through the side groove forming convex portion 12 , and the end core pulling structure 8 passes through the end groove forming convex portion 122 .

[0031] In this embodiment, the side core pulling structure 7 passes through the side groove forming convex portion 12, and the end core pulling structure 8 passes through the end groove forming convex portion 122, which does not affect the core pulling action and has a compact and reasonable structure.

[0032] Combine Figure 2 、 Figure 3 As shown, the side core pulling structure 7 includes a plurality of side straight core pulling rods 13 arranged in the plastic chair body molding upper mold 2. When the mold is closed, the head of the side straight core pulling rod 13 extends into the side groove molding recess 10. The head of the side straight core pulling rod 13 is provided with a side hole molding convex shaft body 14, and the diameter of the side hole molding convex shaft body 14 is smaller than the diameter of the side straight core pulling rod 13.

[0033] In this embodiment, during the injection molding process, the side hole molding protrusion 14 of the side straight core pulling rod 13 extends into the side groove molding concave portion 10 to synchronously mold the side hole groove structure of the plastic part. The diameter of the side hole molding protrusion 14 is smaller than the diameter of the side straight core pulling rod 13. There will be no jamming during core pulling and demolding, and the core pulling is smooth and reasonable.

[0034] Combine Figure 2-3 As shown, the end core pulling structure 8 includes a plurality of end straight core pulling rods 15 arranged in the plastic chair body molding upper mold 2. When the mold is closed, the heads of the end straight core pulling rods 15 extend into the end groove molding recess 11. The heads of the end straight core pulling rods 15 are provided with end hole molding convex shaft bodies 16. The diameter of the end hole molding convex shaft body 16 is smaller than the diameter of the end straight core pulling rods 15.

[0035] In this embodiment, during the injection molding process, the end hole forming convex shaft body 16 of the end straight core pulling rod 15 extends into the end groove forming concave portion 11 to synchronously mold the end hole groove structure of the plastic part. The diameter of the end hole forming convex shaft body 16 is smaller than the diameter of the end straight core pulling rod 15. There will be no jamming during core pulling and demolding, and the core pulling is smooth and reasonable.

[0036] Combine Figure 1-4 As shown, the oblique sliding drive mechanism 9 includes an end fixing seat 17 and two side fixing seats 18 arranged on the outside of the plastic chair body molding upper mold 2, the end fixing seat 17 is provided with an end inner slide 19 that can move back and forth linearly up and down, the end straight core pulling rod 15 is slidably matched with the end inner slide 19, the side fixing seat 18 is provided with a side inner slide 20 that can move back and forth linearly up and down, and the side straight core pulling rod 13 is slidably matched with the side inner slide 20.

[0037] In this embodiment, the end inner slide 19 can slide up and down along the end fixed seat 17. When the end inner slide 19 moves downward, the end inner slide 19 can drive the end straight core-pulling rod 15 to pull the core away from the end of the plastic part. The side inner slide 20 can slide up and down along the side fixed seat 18. When the side inner slide 20 moves downward, the side inner slide 20 can drive the side straight core-pulling rod 13 to pull the core away from the end of the plastic part.

[0038] Combine Figure 1-4 As shown, a first inclined slide 21 is provided in the end inner slide 19, a second inclined slide 22 is provided in the side inner slide 20, and an oil cylinder 23 is provided on the outside of the plastic chair body molding upper mold 2 for driving the end inner slide 19 and the side inner slide 20 to slide up and down.

[0039] In this embodiment, the oil cylinder 23 is used to drive the end inner slide 19 and the side inner slide 20 to slide up and down. A first inclined slide 21 is provided in the end inner slide 19, and a second inclined slide 22 is provided in the side inner slide 20. The up and down sliding and the effect of the inclined surface are used to drive the end straight core pulling rod 15 and the side straight core pulling rod 13 to perform horizontal core pulling, which can greatly reduce the lateral space occupied by the mold and at the same time can more accurately control the core pulling distance.

[0040] Combine Figure 1-3 As shown, the straight ejector 6 includes a straight ejector plate 24 arranged below the plastic chair body molding lower mold 1, and a plurality of straight ejector rods 25 are provided on the straight ejector plate 24. The side straight core pulling rods 13 and the end straight core pulling rods 15 are respectively staggered with the straight ejector rods 25.

[0041] In this embodiment, after the core pulling is completed, the mold is opened, and the straight ejector plate 24 is moved upward, driving the straight ejector rod 25 to move upward synchronously, and the molded plastic part is ejected from the mold by the straight ejector rod 25.

[0042] The working principle of this utility model is:

[0043] During the injection molding process, the plastic chair body molding lower mold 1 and the plastic chair body molding upper mold 2 are brought close to each other, so that the chair body molding protrusion 4 and the chair body molding cavity 5 are fitted together to form a complete cavity. The molten material is injected into the cavity through the injection molding main board 3. The side groove molding concave portion 10 is opposite to the side groove molding convex portion 12 to form the side groove structure of the plastic part. The end groove molding concave portion 11 is opposite to the end groove molding convex portion 122 to form the end groove structure of the plastic part. No secondary processing is required.

[0044] The side core pulling structure 7 passes through the side groove forming convex part 12, and the end core pulling structure 8 passes through the end groove forming convex part 122, which does not affect the core pulling action. The structure is compact and reasonable. During the injection molding process, the side hole forming convex shaft body 14 of the side straight core pulling rod 13 extends into the side groove forming concave part 10 to synchronously mold the side hole groove structure of the plastic part. The diameter of the side hole forming convex shaft body 14 is smaller than the diameter of the side straight core pulling rod 13. There will be no jamming during core pulling and demoulding, and the core pulling is smooth and reasonable.

[0045] During the injection molding process, the end hole forming convex shaft body 16 of the end straight core pulling rod 15 extends into the end groove forming concave portion 11 to synchronously mold the end hole groove structure of the plastic part. The diameter of the end hole forming convex shaft body 16 is smaller than the diameter of the end straight core pulling rod 15. There will be no jamming when the core is pulled out of the mold, and the core pulling is smooth and reasonable.

[0046] The end inner slide 19 can slide up and down along the end fixed seat 17. When the end inner slide 19 moves downward, the end inner slide 19 can drive the end straight core-pulling rod 15 to the end away from the plastic part to pull the core. The side inner slide 20 can slide up and down along the side fixed seat 18. When the side inner slide 20 moves downward, the side inner slide 20 can drive the side straight core-pulling rod 13 to the end away from the plastic part to pull the core.

[0047] The oil cylinder 23 is used to drive the end inner slide 19 and the side inner slide 20 to slide up and down. The end inner slide 19 is provided with a first inclined slide 21, and the side inner slide 20 is provided with a second inclined slide 22. The use of up and down sliding and the effect of the inclined surface to drive the end straight core pulling rod 15 and the side straight core pulling rod 13 to perform horizontal core pulling can greatly reduce the horizontal space occupied by the mold and at the same time can more accurately control the core pulling distance.

[0048] After the core pulling is completed, the mold is opened, and the straight ejector plate 24 is moved upward, driving the straight ejector rod 25 to move upward synchronously, and the molded plastic part is ejected from the mold by the straight ejector rod 25.

[0049] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described, or replace them with similar methods, without departing from the spirit of the present invention.

[0050] Although this document frequently uses the terms plastic chair body molding lower mold 1, plastic chair body molding upper mold 2, injection molding main board 3, chair body molding protrusion 4, chair body molding cavity 5, straight ejector 6, side core pulling structure 7, end core pulling structure 8, inclined sliding drive mechanism 9, side groove molding concave portion 10, end groove molding concave portion 11, side groove molding protrusion 12, side straight core pulling rod 13, side hole molding protruding shaft body 14, end straight core pulling rod 15, end hole molding protruding shaft body 16, end fixing seat 17, side fixing seat 18, end inner slide 19, side inner slide 20, first inclined chute 21, second inclined chute 22, oil cylinder 23, straight ejector plate 24, straight ejector rod 25, etc., the possibility of using other terms is not excluded. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the present invention. Interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A side oblique core pulling mechanism of a plastic chair injection mold, comprising a plastic chair body molding lower mold (1) and a plastic chair body molding upper mold (2), characterized in that: An injection molding main board (3) is provided above the plastic chair body molding upper mold (2), a chair body molding protrusion (4) is provided on the plastic chair body molding lower mold (1), a chair body molding cavity (5) is provided in the plastic chair body molding upper mold (2), the chair body molding protrusion (4) corresponds to the position of the chair body molding cavity (5) and the shape is adapted thereto, a straight top piece (6) is provided below the plastic chair body molding lower mold (1) and passes through the plastic chair body molding lower mold (1) and the chair body molding protrusion (4) in sequence, a side core pulling structure (7) and an end core pulling structure (8) that can perform reciprocating linear motion along one end close to or away from the chair body molding protrusion (4) are provided in the plastic chair body molding upper mold (2), and an inclined sliding drive mechanism (9) for driving the side core pulling structure (7) and the end core pulling structure (8) to move horizontally is provided on the outside of the plastic chair body molding upper mold (2).

2. The side oblique core pulling mechanism of the plastic chair injection mold according to claim 1, characterized in that: The chair body molding protrusion (4) is provided with a side groove molding concave portion (10) and an end groove molding concave portion (11), and the chair body molding cavity (5) is provided with a side groove molding convex portion (12) and an end groove molding convex portion (122), the side groove molding concave portion (10) corresponds to the position of the side groove molding convex portion (12) and the shape is adapted thereto, and the end groove molding concave portion (11) corresponds to the position of the end groove molding convex portion (122) and the shape is adapted thereto.

3. The side oblique core pulling mechanism of the plastic chair injection mold according to claim 2, characterized in that: The side core-pulling structure (7) passes through the side groove forming convex portion (12), and the end core-pulling structure (8) passes through the end groove forming convex portion (122).

4. The side oblique core pulling mechanism of the plastic chair injection mold according to claim 3, characterized in that: The side core pulling structure (7) includes a plurality of side straight core pulling rods (13) arranged in the upper mold (2) for forming the plastic chair body. When the mold is closed, the heads of the side straight core pulling rods (13) extend into the side groove forming concave portion (10).

5. The side oblique core pulling mechanism of the plastic chair injection mold according to claim 4, characterized in that: The head of the side straight core-pulling rod (13) is provided with a side hole forming convex shaft body (14), and the diameter of the side hole forming convex shaft body (14) is smaller than the diameter of the side straight core-pulling rod (13).

6. The side oblique core pulling mechanism of the plastic chair injection mold according to claim 5, characterized in that: The end core pulling structure (8) includes a plurality of end straight core pulling rods (15) arranged in the upper mold (2) for forming the plastic chair body. When the mold is closed, the heads of the end straight core pulling rods (15) extend into the end groove forming concave portion (11).

7. The side oblique core-pulling mechanism of the plastic chair injection mold according to claim 6, characterized in that: The head of the end straight core-pulling rod (15) is provided with an end hole forming convex shaft body (16), and the diameter of the end hole forming convex shaft body (16) is smaller than the diameter of the end straight core-pulling rod (15).

8. The side oblique core pulling mechanism of the plastic chair injection mold according to claim 7, characterized in that: The oblique sliding drive mechanism (9) comprises an end fixing seat (17) and two side fixing seats (18) arranged on the outside of the plastic chair body molding upper mold (2); an end inner slide (19) capable of reciprocating linear motion up and down is provided in the end fixing seat (17); the end straight core pulling rod (15) is slidably matched with the end inner slide (19); the side fixing seat (18) is provided with a side inner slide (20) capable of reciprocating linear motion up and down; the side straight core pulling rod (13) is slidably matched with the side inner slide (20).

9. The side oblique core-pulling mechanism of the plastic chair injection mold according to claim 8, characterized in that: A first inclined slide groove (21) is provided in the end inner slide (19), a second inclined slide groove (22) is provided in the side inner slide (20), and an oil cylinder (23) for driving the end inner slide (19) and the side inner slide (20) to slide up and down is provided on the outside of the plastic chair body forming upper mold (2).

10. The side oblique core pulling mechanism of the plastic chair injection mold according to claim 9, characterized in that: The straight top piece (6) comprises a straight top plate (24) arranged below the lower mold (1) for forming the plastic chair body, a plurality of straight top rods (25) are provided on the straight top plate (24), and the side straight core pulling rods (13) and the end straight core pulling rods (15) are respectively arranged in an interlaced manner with the straight top rods (25).

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