Leaf spring jack necking tool

Abstract

The invention discloses a leaf spring jack necking tool which comprises a bottom plate, the middle of the bottom plate is fixedly connected with a vertically-upward fixed vertical plate through screws, and the top end of the fixed vertical plate is provided with a clamping mechanism used for clamping a leaf spring and a necking mechanism used for necking the clamped leaf spring. The clamping mechanism comprises a sliding seat fixedly connected to the top end of the fixed vertical plate through a screw, two parallel T-shaped guide sliding rails are arranged at the top end of the sliding seat, clamping sliding blocks are slidably connected to the two ends of one guide sliding rail, product clamping heads are arranged at the top ends of the clamping sliding blocks, and the product clamping heads are connected with the two ends of the other guide sliding rail. Clamping grooves are formed in the opposite surfaces of the two product clamping heads; the two product clamping heads are opened or clamped at the same time, so that the center position of a product cannot be changed, the two necking dies move towards the center position at the same time, the situation that the product is not concentric after necking is avoided, necking is conducted after the product is clamped, and product necking is more stable.

Description

Technical Field

[0001] The present invention relates to the technical field of leaf springs, and particularly to a leaf spring jack necking tooling. Background Art

[0002] A leaf spring is an elastic female terminal made of an elastic metal material, mainly used for the transmission of electrical signals and the transfer of current. Currently, for the necking tooling of leaf spring jacks, most of them adopt unilateral movement, and the necking of the leaf spring jack is carried out when the product is not clamped, so the necking of the leaf spring jack will cause unilateral deformation, the elastic blades are asymmetric, and the center is offset. Summary of the Invention

[0003] To solve the defects existing in the prior art, the present invention provides a leaf spring jack necking tooling.

[0004] To solve the above technical problems, the present invention provides the following technical solutions:

[0005] A leaf spring jack necking tooling of the present invention includes a bottom plate. A vertical fixed plate is fixedly connected to the middle of the bottom plate by screws. At the top of the fixed plate, there is a clamping mechanism for clamping the leaf spring and a necking mechanism for necking the clamped leaf spring. The clamping mechanism includes a sliding seat fixedly connected to the top of the fixed plate by screws. At the top of the sliding seat, there are two parallel and T-shaped guiding slide rails. At both ends of one of the guiding slide rails, there are slidingly connected clamping sliders. At the top of the clamping sliders, there are product clamping heads. Clamping grooves are opened on the opposite surfaces of the two product clamping heads. On one side of the fixed plate, there is a clamping driving assembly for synchronously driving the two product clamping heads to move towards or away from each other along the guiding slide rails. The necking mechanism includes necking sliders slidingly arranged at both ends of the other guiding slide rail. At the top of the necking sliders, there are necking dies. Necking grooves are opened on the opposite surfaces of the two necking dies. On the other side of the fixed plate, there is a necking driving assembly for synchronously driving the two necking dies to move towards or away from each other.

[0006] As a preferred technical solution of the present invention, the clamping driving assembly includes a clamping dial arranged on the clamping slider. The outer end of the clamping dial is fixedly connected to a clamping lever by screws. The upper end of the clamping lever is fixedly connected to the sliding seat by a lever shaft. A first groove matching and clamping with the clamping dial is opened at the top of the clamping slider.

[0007] As a preferred technical solution of the present invention, first T-shaped grooves are opened on the opposite surfaces of the two clamping sliders. At the bottom end of the product clamping head, there is a first T-shaped block matching and clamping with the first T-shaped groove.

[0008] As a preferred technical solution of the present invention, a clamping cylinder is fixedly installed on one side of the fixed vertical plate through screws. The output shaft of the clamping cylinder is fixedly connected with a clamping connection block through screws. One end of the clamping connection block is fixedly connected with a clamping slide plate. First inclined blocks are provided at both ends of the clamping slide plate. First inclined grooves matching the two first inclined blocks are opened at the bottom end of the clamping lever.

[0009] As a preferred technical solution of the present invention, the necking driving assembly includes a necking dial block provided on the necking slider. The outer end of the necking dial block is fixedly connected with a necking lever through screws. The upper end of the necking lever is fixedly connected to the sliding seat through a lever shaft. A second groove matching and clamping the necking dial block is opened at the top end of the necking slider.

[0010] As a preferred technical solution of the present invention, second T-shaped grooves are opened on the opposite surfaces of the two necking sliders. Second T-shaped blocks matching and clamping the second T-shaped grooves are provided at the bottom end of the necking die.

[0011] As a preferred technical solution of the present invention, a necking cylinder is fixedly installed on the other side of the fixed vertical plate through screws. The output shaft of the necking cylinder is fixedly connected with a necking connection block through screws. One end of the necking connection block is fixedly connected with a necking slide plate. Second inclined blocks are provided at both ends of the necking slide plate. Second inclined grooves matching the second inclined blocks are opened at the bottom end of the necking lever.

[0012] As a preferred technical solution of the present invention, a clamping guide block is fixedly connected to the inner wall of the clamping slide plate through screws. A necking guide block is fixedly connected to the inner wall of the necking slide plate through screws. Bearings located on both sides of the clamping guide block and the necking guide block are connected to the fixed vertical plate through bearing shafts.

[0013] As a preferred technical solution of the present invention, T-shaped fixing columns are fixedly connected to both sides of the fixed vertical plate through screws. Waist-shaped holes matching the fixing columns are opened at both ends of the clamping slide plate and the necking slide plate.

[0014] As a preferred technical solution of the present invention, a product chuck baffle and a necking die baffle are respectively provided on the two surfaces of the fixed vertical plate. A limiting plate is fixedly connected to the top corner on one side of the fixed vertical plate through screws.

[0015] The beneficial effects of the present invention are:

[0016] 1. This type of leaf spring socket shrinking tooling can drive the two clamping sliders to approach each other through the clamping drive assembly, and the clamping slider drives the product clamping head to move toward the middle. The two clamping grooves of the two product clamping heads fix and clamp the product. The shrinking drive assembly drives the two shrinking sliders to approach each other, thereby driving the two shrinking dies to slide toward the middle and complete the shrinking of the product. After the shrinking is completed, the shrinking drive assembly simultaneously drives the two shrinking sliders away from each other, thereby making the two shrinking dies move away from each other. The clamping drive assembly simultaneously drives the two clamping sliders away from each other, thereby making the two product clamping heads move away from each other. By opening or clamping the two product clamping heads at the same time, the center position of the product will not change. By having the two shrinking dies move toward the center position at the same time, the occurrence of eccentricity of the product after shrinking is avoided. The product is clamped first and then shrinked, making the product shrinkage more stable.

[0017] 2. This type of leaf spring socket shrinking tooling, when clamping, the output shaft of the clamping cylinder pushes the clamping connecting block to move upward, the clamping connecting block pushes the clamping slide to slide upward, the clamping slide causes the two first oblique blocks to move upward, the first oblique blocks match the first oblique groove, so that the two clamping levers rotate through the lever shaft, the clamping lever drives the clamping shift block to rotate, the clamping shift block pushes the clamping slide block to move through the first groove, the clamping slide block drives the product clamping head to move to clamp the product, the clamping of the product amplifies the clamping force through the lever, and the product is clamped tighter.

[0018] 3. For this type of leaf spring socket shrinking tooling, when shrinking, the output shaft of the shrinking cylinder pushes the shrinking connecting block to move, and the shrinking connecting block pushes the shrinking slide to move upward. The two second inclined blocks on the shrinking slide move upward, causing the shrinking lever to rotate through the lever shaft. The rotation of the shrinking lever drives the shrinking shift block to rotate, and the rotation of the shrinking shift block causes the shrinking slider to move, so that the two shrinking dies are close to each other to shrink the product. The shrinking of the product is achieved through the lever, which makes the shrinking force greater and the shrinking more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the main structure of a leaf spring socket shrinking tooling of the present invention;

[0021] Figure 2 It is a rear view structural schematic diagram of a leaf spring socket shrinking tooling of the present invention;

[0022] Figure 3 It is a rear exploded structural diagram of a leaf spring socket shrinking tool of the present invention;

[0023] Figure 4 It is a schematic side explosion structure diagram of a spring piece jack necking tooling of the present invention;

[0024] Figure 5 It is a schematic structure diagram of a necking die of a spring piece jack necking tooling of the present invention.

[0025] In the figure: 1. Base plate; 2. Fixed vertical plate; 3. Clamping mechanism; 4. Necking mechanism; 5. Slide seat; 6. Guide slide rail; 7. Clamping slider; 8. Product clamping head; 9. Clamping groove; 10. Clamping drive assembly; 11. Necking slider; 12. Necking die; 13. Necking groove; 14. Necking drive assembly; 15. Clamping block; 16. Clamping lever; 17. Lever shaft; 18. First groove; 19. First T-shaped groove; 20. First T-shaped block; 21. Clamping cylinder; 22. Clamping connection block; 23. Clamping slide plate; 24. First inclined block; 25. First inclined groove; 26. Necking block; 27. Necking lever; 28. Second groove; 29. Second T-shaped groove; 30. Second T-shaped block; 31. Necking cylinder; 32. Necking connection block; 33. Necking slide plate; 34. Second inclined block; 35. Second inclined groove; 36. Clamping guide block; 37. Necking guide block; 38. Bearing shaft; 39. Bearing; 40. Fixed column; 41. Kidney-shaped hole; 42. Product chuck baffle; 43. Necking die baffle; 44. Limit plate. Specific embodiments

[0026] The following is a description of the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention and are not intended to limit the present invention.

[0027] Embodiment: As Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown in the figure, a spring leaf jacking and necking tooling of the present invention includes a bottom plate 1. The middle part of the bottom plate 1 is fixedly connected with a vertically upward fixed vertical plate 2 by screws. The top of the fixed vertical plate 2 is provided with a clamping mechanism 3 for clamping the spring leaf and a necking mechanism 4 for necking the clamped spring leaf. The clamping mechanism 3 includes a sliding seat 5 fixedly connected to the top of the fixed vertical plate 2 by screws. The top of the sliding seat 5 is provided with two parallel and T-shaped guiding slide rails 6. Both ends of one of the guiding slide rails 6 are slidably connected with clamping sliders 7. The bottom end of the clamping slider 7 is provided with a first guiding chute matching the guiding slide rail 6. The top end of the clamping slider 7 is provided with a product clamping head 8. Clamping grooves 9 are formed on the opposite surfaces of the two product clamping heads 8. One side of the solid vertical plate 2 is provided with a clamping driving assembly 10 for synchronously driving the two product clamping heads 8 to move towards or away from each other along the guiding slide rail 6. The necking mechanism 4 includes necking sliders 11 slidably arranged at both ends of the other guiding slide rail 6. The bottom end of the necking slider 11 is provided with a second guiding chute matching the guiding slide rail 6. The top end of the necking slider 11 is provided with a necking die 12. Necking grooves 13 are formed on the opposite surfaces of the two necking dies 12. The other side of the fixed vertical plate 2 is provided with a necking driving assembly 14 for synchronously driving the two necking dies 12 to move towards or away from each other. By means of the provided clamping driving assembly 10, the two clamping sliders 7 can be driven to approach each other. The clamping sliders 7 drive the product clamping heads 8 to move towards the middle. The two clamping grooves 9 of the two product clamping heads 8 fix and clamp the product. The necking driving assembly 14 drives the two necking sliders 11 to approach each other, thereby driving the two necking dies 12 to slide towards the middle and completing the necking of the product. After the necking is completed, the necking driving assembly 14 simultaneously drives the two necking sliders 11 to move away from each other, so that the two necking dies 12 move away from each other. The clamping driving assembly 10 simultaneously drives the two clamping sliders 7 to move away from each other, so that the two product clamping heads 8 move away from each other. By simultaneously opening or clamping the two product clamping heads 8, the central position of the product will not change. By simultaneously moving the two necking dies 12 towards the central position, the situation of non-concentricity after the product is necked is avoided. The product is clamped first and then necked, making the necking of the product more stable.

[0028] Among them, the clamping driving assembly 10 includes a clamping dial block 15 arranged on the clamping slider 7. The outer end of the clamping dial block 15 is fixedly connected with a clamping lever 16 by screws. The upper end of the clamping lever 16 is fixedly connected to the sliding seat 5 through a lever shaft 17. A first groove 18 matching and clamping the clamping dial block 15 is formed at the top end of the clamping slider 7. The clamping lever 16 rotates through the lever shaft 17, so that the clamping lever 16 drives the clamping slider 7 to move through the first groove 18.

[0029] Wherein, first T-shaped grooves 19 are formed on opposite faces of the two clamping sliders 7, and a first T-shaped block 20 that is matingly engaged with the first T-shaped groove 19 is provided at the bottom end of the product clamping head 8. The product clamping head 8 is assembled on the clamping slider 7 through the first T-shaped groove 19.

[0030] Wherein, a clamping cylinder 21 is fixedly installed on one side of the fixed vertical plate 2 by screws. The output shaft of the clamping cylinder 21 is fixedly connected to a clamping connection block 22 by screws. One end of the clamping connection block 22 is fixedly connected to a clamping slide plate 23. First inclined blocks 24 are provided at both ends of the clamping slide plate 23. A first inclined groove 25 that is matingly engaged with the two first inclined blocks 24 is formed at the bottom end of the clamping lever 16. The output shaft of the clamping cylinder 21 pushes the clamping connection block 22 upward. The clamping connection block 22 pushes the clamping slide plate 23 to slide upward. The clamping slide plate 23 causes the two first inclined blocks 24 to move upward. The first inclined block 24 and the first inclined groove 25 are matingly engaged, causing the clamping lever 16 to rotate through the lever shaft 17.

[0031] Wherein, the necking drive assembly 14 includes a necking dial block 26 provided on the necking slider 11. The outer end of the necking dial block 26 is fixedly connected to a necking lever 27 by screws. The upper end of the necking lever 27 is fixedly connected to the slide base 5 through the lever shaft 17. A second groove 28 that is matingly engaged with the necking dial block 26 is formed at the top end of the necking slider 11. Second T-shaped grooves 29 are formed on opposite faces of the two necking sliders 11. A second T-shaped block 30 that is matingly engaged with the second T-shaped groove 29 is provided at the bottom end of the necking die 12. The necking die 12 is assembled onto the necking slider 11 through the second T-shaped groove 29. A necking cylinder 31 is fixedly installed on the other side of the fixed vertical plate 2 by screws. The output shaft of the necking cylinder 31 is fixedly connected to a necking connection block 32 by screws. One end of the necking connection block 32 is fixedly connected to a necking slide plate 33. Second inclined blocks 34 are provided at both ends of the necking slide plate 33. A second inclined groove 35 that is matingly engaged with the second inclined blocks 34 is formed at the bottom end of the necking lever 27. The output shaft of the necking cylinder 31 pushes the necking connection block 32 to move. The necking connection block 32 pushes the necking slide plate 33 to move upward. The two second inclined blocks 34 on the necking slide plate 33 move upward, causing the necking lever 27 to rotate through the lever shaft 17. The rotation of the necking lever 27 drives the necking dial block 26 to rotate. The rotation of the necking dial block 26 causes the necking slider 11 to move.

[0032] Wherein, a clamping guide block 36 is fixedly connected to the inner wall of the clamping slide plate 23 by screws, and a necking-down guide block 37 is fixedly connected to the inner wall of the necking-down slide plate 33 by screws. A bearing 39 located on both sides of the clamping guide block 36 and the necking-down guide block 37 is connected to the fixed vertical plate 2 through a bearing shaft 38, which can guide the movement of the clamping slide plate 23 and the necking-down slide plate 33, enabling the clamping slide plate 23 and the necking-down slide plate 33 to move up and down. The setting of the bearing 39 improves the smoothness of the movement of the clamping slide plate 23 and the necking-down slide plate 33.

[0033] Wherein, T-shaped fixing columns 40 are fixedly connected to both sides of the fixed vertical plate 2 by screws, and waist-shaped holes 41 matching the fixing columns 40 are provided at both ends of the clamping slide plate 23 and the necking-down slide plate 33. The clamping slide plate 23 and the necking-down slide plate 33 are fixed by screws through the fixing columns 40. When the clamping slide plate 23 and the necking-down slide plate 33 move, the clamping slide plate 23 and the necking-down slide plate 33 move upward, and relative movement occurs between the fixing columns 40 and the waist-shaped holes 41.

[0034] Wherein, a product chuck baffle 42 and a necking-down die baffle 43 are respectively fixedly connected to both sides of the fixed vertical plate 2 by screws, and a limiting plate 44 is fixedly connected to the top corner on one side of the fixed vertical plate 2 by screws. The two product clamping heads 8 can be blocked by the provided product chuck baffle 42, and the two necking-down dies 12 can be blocked by the setting of the necking-down die baffle 43. To replace the product, only the product chuck baffle 42 and the necking-down die baffle 43 need to be loosened, and the product clamping heads 8 and the necking-down dies 12 can be replaced, making the product change more convenient.

[0035] Wherein, a PLC controller can be installed on the bottom plate 1 to control the actions of the clamping cylinder 21 and the necking-down cylinder 31, and repeat the operation to perform batch necking-down processing on the products.

[0036] During operation, for this kind of leaf spring socket necking tooling, through the provided clamping drive assembly 10, two clamping sliders 7 can be driven to approach each other. The clamping sliders 7 drive the product clamping heads 8 to move towards the middle. The two clamping grooves 9 of the two product clamping heads 8 fix and clamp the product. The necking drive assembly 14 drives the two necking sliders 11 to approach each other, thereby driving the two necking dies 12 to slide towards the middle and complete the necking of the product. After the necking is completed, the necking drive assembly 14 simultaneously drives the two necking sliders 11 to move away from each other, so that the two necking dies 12 move away from each other. The clamping drive assembly 10 simultaneously drives the two clamping sliders 7 to move away from each other, so that the two product clamping heads 8 move away from each other. By simultaneously opening or clamping the two product clamping heads 8, the central position of the product will not change. By simultaneously moving the two necking dies 12 towards the central position, the situation of the product being non-concentric after necking is avoided. The product is first clamped and then necked, making the necking of the product more stable. When clamping, the output shaft of the clamping cylinder 21 pushes the clamping connection block 22 upward. The clamping connection block 22 pushes the clamping slide plate 23 to slide upward. The clamping slide plate 23 causes the two first inclined blocks 24 to move upward. The first inclined blocks 24 match the first inclined grooves 25, so that the two clamping levers 16 rotate through the lever shaft 17. The clamping levers 16 drive the clamping blocks 15 to rotate. The clamping blocks 15 push the clamping sliders 7 to move through the first grooves 18. The clamping sliders 7 drive the product clamping heads 8 to move to clamp the product. The clamping of the product amplifies the clamping force through the lever, and the product is clamped tighter. When necking, the output shaft of the necking cylinder 31 pushes the necking connection block 32 to move. The necking connection block 32 pushes the necking slide plate 33 to move upward. The two second inclined blocks 34 on the necking slide plate 33 move upward, causing the necking levers 27 to rotate through the lever shaft 17. The rotation of the necking levers 27 drives the necking blocks 26 to rotate. The rotation of the necking blocks 26 causes the necking sliders 11 to move, so that the two necking dies 12 approach each other to perform necking treatment on the product. The necking of the product is through the lever, making the necking force greater and the necking more stable.

[0037] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A sheet spring jack necking tooling, characterized in that It includes a bottom plate (1), and a vertically upward fixed vertical plate (2) is fixedly connected to the middle of the bottom plate (1) by screws. At the top of the fixed vertical plate (2), there is a clamping mechanism (3) for clamping a leaf spring and a necking mechanism (4) for necking the clamped leaf spring. The clamping mechanism (3) includes a sliding seat (5) fixedly connected to the top of the fixed vertical plate (2) by screws. At the top of the sliding seat (5), there are two parallel and T-shaped guiding sliding rails (6). At both ends of one of the guiding sliding rails (6), clamping sliders (7) are slidably connected. At the top of the clamping sliders (7), there are product clamping heads (8). Clamping grooves (9) are formed on the opposite surfaces of the two product clamping heads (8). On one side of the solid vertical plate (2), there is a clamping driving assembly (10) for synchronously driving the two product clamping heads (8) to move towards each other or away from each other along the guiding sliding rails (6). The necking mechanism (4) includes necking sliders (11) slidably arranged at both ends of the other guiding sliding rail (6). At the top of the necking sliders (11), there are necking dies (12). Necking grooves (13) are formed on the opposite surfaces of the two necking dies (12). On the other side of the fixed vertical plate (2), there is a necking driving assembly (14) for synchronously driving the two necking dies (12) to move towards each other or away from each other.

2. The sheet spring jack necking tool according to claim 1, characterized in that The clamping driving assembly (10) includes a clamping dial block (15) arranged on the clamping slider (7). The outer end of the clamping dial block (15) is fixedly connected to a clamping lever (16) by screws. The upper end of the clamping lever (16) is fixedly connected to the sliding seat (5) by a lever shaft (17). A first groove (18) that is matched and clamped with the clamping dial block (15) is formed at the top of the clamping slider (7).

3. A leaf spring jack necking tool according to claim 2, characterized in that First T-shaped grooves (19) are formed on the opposite surfaces of the two clamping sliders (7). At the bottom end of the product clamping head (8), there is a first T-shaped block (20) that is matched and clamped with the first T-shaped groove (19).

4. A leaf spring jack necking tool according to claim 3, characterized in that, On one side of the fixed vertical plate (2), a clamping cylinder (21) is fixedly installed by screws. The output shaft of the clamping cylinder (21) is fixedly connected to a clamping connection block (22) by screws. One end of the clamping connection block (22) is fixedly connected to a clamping sliding plate (23). At both ends of the clamping sliding plate (23), there are first inclined blocks (24). A first inclined groove (25) that is matched with the two first inclined blocks (24) is formed at the bottom end of the clamping lever (16).

5. A leaf spring jack necking tool according to claim 4, characterized in that, The necking driving assembly (14) includes a necking dial block (26) arranged on the necking slider (11). The outer end of the necking dial block (26) is fixedly connected to a necking lever (27) by screws. The upper end of the necking lever (27) is fixedly connected to the sliding seat (5) by a lever shaft (17). A second groove (28) that is matched and clamped with the necking dial block (26) is formed at the top of the necking slider (11).

6. A leaf spring jack necking tool according to claim 5, characterized in that, Second T-shaped grooves (29) are formed on the opposite surfaces of the two necking sliders (11). At the bottom end of the necking die (12), there is a second T-shaped block (30) that is matched and clamped with the second T-shaped groove (29).

7. A leaf spring jack necking tool according to claim 1, characterized in that On the other side of the fixed vertical plate (2), a necking cylinder (31) is fixedly installed by screws. The output shaft of the necking cylinder (31) is fixedly connected by screws to a necking connection block (32). One end of the necking connection block (32) is fixedly connected to a necking slide plate (33). Second inclined blocks (34) are provided at both ends of the necking slide plate (33). A second inclined groove (35) matching the second inclined block (34) is provided at the bottom end of the necking lever (27).

8. A leaf spring jack necking tool according to claim 4, characterized in that A clamping guide block (36) is fixedly connected to the inner wall of the clamping slide plate (23) by screws. A necking guide block (37) is fixedly connected to the inner wall of the necking slide plate (33) by screws. A bearing (39) located on both sides of the clamping guide block (36) and the necking guide block (37) is connected to the fixed vertical plate (2) through a bearing shaft (38).

9. The a leaf spring jacking necking tool according to claim 1, characterized in that, T-shaped fixing columns (40) are fixedly connected to both sides of the fixed vertical plate (2) by screws. Waist-shaped holes (41) matching the fixing columns (40) are provided at both ends of the clamping slide plate (23) and the necking slide plate (33).

10. A leaf spring jack retracting tool according to claim 1, characterized in that, A product chuck baffle (42) and a necking die baffle (43) are respectively provided on the two sides of the fixed vertical plate (2). A limiting plate (44) is fixedly connected to the top corner on one side of the fixed vertical plate (2) by screws.

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