KR100779506B1 - A harrow of folding wire rope for tractor - Google Patents

Abstract

A foldable harrow for a tractor using a wire rope is provided to pivot a main harrow up and down by operating a hydraulic cylinder, and fold or unfold a subsidiary harrow easily by pulling or pushing a wire rope in concurrence with the operation of the hydraulic cylinder. A foldable harrow for a tractor using a wire rope includes: a connection frame(110) installed on the rear of a rotavator; a pair of coupling frames(120) coupled to both sides of the connection frame; a main harrow(130) installed on the front end of the coupling frame; a pair of subsidiary harrows(140) folded or unfolded based on a hinge shaft(131a) formed on the main harrow; a hydraulic cylinder(150) connected to a pivot of the connection frame and a bracket(151) of the main harrow; a guide bar(152); an ascent guide bar(153); a moving bracket(154); a wire rope mover(155); a wire rope(160) installed on a locking shaft and the subsidiary harrow; a clamp(170); a guide bracket(180); and a horizontal angle adjusting member(190).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a harrow for folding wire rope for tractor,

1 is a perspective view showing a structure of a wire rope folding type harness for a tractor according to the present invention.

2 is a sectional view taken along the line A-A in Fig.

3 is a front perspective view showing a folded state of the auxiliary harrow in the wire rope folding type harness for a tractor according to the present invention.

4 is a rear perspective view showing a folded state of the auxiliary harrow in the wire rope folding type harrow for a tractor according to the present invention.

FIG. 5 is a reference view for showing a left-right rotation state of a connecting frame and a hydraulic cylinder in a wire rope folding type harrow for a tractor according to the present invention.

6 is an exploded perspective view showing a structure of a main harrow in a wire rope folding type harness for a tractor according to the present invention.

FIG. 7 is an exploded perspective view showing the structure of a secondary harness in a wire rope folding type harrow for a tractor according to the present invention. FIG.

8 is an exploded perspective view showing the structure of a horizontal angle adjusting member in a wire rope folding type harrow for a tractor according to the present invention.

Fig. 9 is a use state view of a horizontal angle adjusting member in a wire rope folding type harness for a tractor according to the present invention.

10 is a perspective view showing the structure of a wire rope operating means in a wire rope folding type harness for a tractor according to the present invention.

Fig. 11 is a use state view of the wire rope operating means in the tractor wire rope folding type harrow.

Fig. 12 is a side view showing the state of bending of a main harrow in a wire rope folding type harness for a tractor according to the present invention. Fig.

13 to 15 are flowcharts showing the folding state of the auxiliary harrow in the wire rope folding harrow for a tractor according to the present invention.

16 is a perspective view for showing a state in which a wire rope folding type harness for a tractor according to the present invention is mounted on a rotor bed;

17 is a use state view of a wire rope folding type harrow for a tractor according to the present invention.

Description of the Related Art [0002]

10: tractor 20: rotor baler (rotary)

100: Wire rope folding type harrow for tractor of the present invention

110: Coupling frame

120: connection frame 121:

130: main harrow 131: harrow frame

131a: Hinge shaft 132: Harness

132a: Flat blade 132b: Drain groove

132c: bolt connecting hole 133: stopper

140: Auxiliary harrow 141: Harley frame

142: Harness 142a: Flat blade

142b: drainage groove 142c: bolt coupling hole

143:

150: Hydraulic cylinder 150a:

151: bracket 152: guide bar

153: rising guide bar 153a:

153b: rising guiding jaw 154: moving bracket

155: wire rope moving hole 155a:

160: Wire rope

170: clamp 171: wire rope

172: Lever

180: guide bracket 181: guide rod

181a: Hinge shaft

190: Horizontal angle adjustment member 191: Body

191a: Long hole 192: Hinge axis

193: fastening member 194: angle adjusting member

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire rope folding type harrow for a tractor, and more particularly, to a wire rope folding harrow for a tractor which is capable of quickly and conveniently folding and unfolding auxiliary harrows formed on both sides of a main harrow using wire ropes, To a flat wire rope folding type harness for a tractor which can improve the working efficiency by inducing a smooth flat work of the wire rope.

Generally, the harrow is an agricultural machine for improving the working efficiency of the planting and drying by carrying out the flatness work of the non-nons installed at the rear of the tractor or the rotor batter.

That is, the growth conditions and yield of rice are determined according to the nutritional status of the soil (soil). For this purpose, a rotary batter is used to finely crush the clay so as to be suitable for growing conditions of the rice, And the work of selecting.

Especially, when the flatness of the silkworms is not uniform, the seedlings are planted in the planting process, which causes the growth of the rice plants to be decreased, thereby reducing the yield.

Therefore, the importance of the harness which enables uniform flat work of the non-nonson is highlighted.

As described above, various types of efforts have been made to improve the harness, since the flattening work of the non-nons for rice planting is required more than ever before. As a result of this effort, recently, a tractor or a harrow As a method for carrying out the flat work of the non-ionic material,

A hydraulic cylinder is coupled to a rotary bar fixed to the rear of the tractor, and a cylinder shaft of the hydraulic cylinder is coupled to a coupling bracket fixed to the main shaft. The rotary bar is coupled to the main shaft, And a transfer cap which moves along the fixed gap is installed on the upper surface of the hydraulic cylinder, and the transfer cap is provided with a connecting rod And a safety lever having a locking protrusion formed on a front end of the cylinder shaft. The slide cover is fixed to both sides of the transfer cap, and the slide bar is inserted into the slide cover, and the wire connected to the slide bar is fixed After securing to the bottom of the cap and securing the wire cover A torsion spring is installed between the main and auxiliary shields and a safety pin is connected to the top of the mainsurgical rod. Korea No. 0451135 "Tractor harrow" which consists of a safety harness at the rear of the auxiliary harness and

A hydraulic cylinder is rotatably coupled to a support bracket fixed to the support frame, and a cylinder shaft of the hydraulic cylinder is coupled to a rotary shaft fixed to a rotary shaft of a tractor, And the support frame is rotatably coupled to the main harness and the auxiliary harrow having an extended harness is coupled to both sides of the main harness. The tractor harvester is characterized in that the harness is fixed to the upper and lower sides of the hydraulic cylinder And a connecting rod is coupled to the upper end of the transfer cap and the end of the cylinder shaft so as to be pivotally connected to the transfer cap, On both sides of the cap, a slide cover fitted with a slide bar is fixed, and an auxiliary harness is folded on the slide bar And a safety collar to which a wire is connected is provided on the upper portion of the hydraulic cylinder and on the upper side of the hydraulic cylinder and on the upper side of the main serrul rod and a ring groove formed in the safety collet is installed on the rear side of the auxiliary serrul rod and on the upper side of the transfer cap Utility model registration No. 0374288 "tractor harrow" has been found.

However, the above-described "tractor harness" can be folded or unfolded by operating a wire using a hydraulic cylinder, but this has several problems in terms of structure, and a detailed description thereof will be described below.

- Below -

1. Conventional "tractor harness" means that a connecting rod (transfer rod) connected to the piston rod is moved by the operation of a hydraulic cylinder to move up and down the transfer cap coupled to the end of the connecting rod, The length of the connecting rod must be increased to correspond to the stroke distance of the hydraulic cylinder so that the load is concentrated during operation and the connecting rod is deformed and damaged .

2. Conventional "tractor harness" uses a safety pin (safety collar) and a safety piece (ring groove) on one side of the auxiliary harrow to maintain the folded state of the auxiliary harrow, Considering that it is carried out in water, soil or foreign matter is easily inserted into the safety pin and the safety piece, which makes it impossible to smoothly operate. Therefore, the use efficiency is decreased.

3. Conventional "tractor harrow" is able to operate the main and auxiliary harrows by rotating the hydraulic cylinder in the upper and lower directions with the rotary bar and the rear end of the hydraulic cylinder connected to the rotary, , The harrow is severely twisted in the left and right direction and is easily damaged. As a result, the durability of the harrow is reduced and the life of the harrow is shortened.

4. In the conventional "tractor harrow", the main and auxiliary harrows are provided with a plurality of harnesses at the lower part thereof. However, since the harness and the auxiliary harrow are made of a metal material to increase the overall weight, It is not possible to perform a quick replacement operation and in particular an inefficient problem of using a hydraulic cylinder of a large capacity unnecessarily for smooth operation of the harness.

5. In the conventional "tractor harrow", the main and auxiliary harrows are lowered by the operation of hydraulic cylinders to perform flattening operation. However, in order to increase the flatness efficiency of the tractor in the non- As a result, the flat work and the use efficiency are extremely limited.

6. Conventional "tractor harrow" is designed so that the hinge axis of the main harness connected to rotate with the auxiliary harrow is worn out due to the friction generated in the turning process, so that the auxiliary harrow is tilted in one direction, So that the smooth flattening work of Munon can not proceed.

Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art,

An object of the present invention is to provide a tractor wire rope folding harrow for pivoting the main harrow in the upper and lower directions by operating the hydraulic cylinder and for pulling or pushing the wire rope at the same time as operating the hydraulic cylinder to fold or unfold the auxiliary harrow .

SUMMARY OF THE INVENTION An object of the present invention is to provide a wire rope folding type harness for a tractor for controlling the folding of an auxiliary harrow by easily operating a worker by forming a clamp on both sides of a hydraulic cylinder so as to prevent unfolding of the auxiliary harrow.

It is an object of the present invention to provide a rotary joint capable of freely rotating in the vertical direction as well as in the left and right direction at the joining portions of the joining frame, the hydraulic cylinder, the joining frame, and the connection frame to secure an efficient rotation angle of the main and sub- And to provide a wire rope folding harrow for a tractor.

An object of the present invention is to provide a wire rope harness for a tractor for minimizing weight and durability by fabricating an aluminum material and a profile by breaking the structure of the main and auxiliary harrows, It is intended to provide a conical harness.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wire rope folding type harness for a tractor for increasing the flatness efficiency of a non-knot by adjusting front and rear angles of main and auxiliary sleds connected to a connection frame.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wire rope folding type harness for a tractor for maximizing the flatness efficiency of a non-knot by adjusting the horizontal angle of the auxiliary harrow.

As described above, the construction of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a perspective view showing a structure of a wire rope folding type harness for a tractor according to the present invention, Fig. 2 is a cross-sectional view taken along the line AA of Fig. 1, and Fig. 3 is a cross- Fig. 4 is a rear perspective view showing the folded state of the auxiliary harrow in the wire rope folding type harness for a tractor according to the present invention.

The wire rope folding type harness 100 for a tractor according to the present invention includes a coupling frame 110 installed on the rear side of a rotor bator 20 and a pair of legs 110 formed on opposite sides of the coupling frame 110, A pair of connection frames 120 connected to the main frame 121 and a main shaft 130 installed at the front end of the connection frame 120 and a hinge shaft 131a formed on both sides of the main shaft 130, A pair of auxiliary sleds 140 folded or unfolded as a reference and a pivoting opening 150a formed in the middle of the coupling frame 110 so as to be pivotable in up and down and left and right directions, A guide bar 152 formed on both sides of the hydraulic cylinder 150 and connected to a bracket 151 installed in the middle of the hydraulic cylinder 150, And is formed in the longitudinal direction in connection with the rod, The guide bar 153 is inserted into the guide bar 152 and the upward guide bar 153 to guide the upward and downward guide rails 153a, A movable bracket 154 which is moved only between the guide bracket 154 and the movable bracket 154 and which moves only between the movable bracket 154 and the movable bracket 154, A wire rope 160 connected to the outside of the latching shaft 155a at the other end and installed at one side of the auxiliary harness 140; A clamp 170 for manually fixing the lever 172 by manually pulling or pushing the wire rope 171 against the hooking shaft 155a; And is rotatable in the vertical direction. Inside the bracket 151, (181a), the guide rod 181 can be rotated by the insert consists of a guide bracket 180 is formed so as to be movable in the front-rear direction.

The pivoting shafts 121 and 150a of the present invention have a free rotation angle between the connection frame 121 and the hydraulic cylinder 150 so that the main shovel 130 and the auxiliary shovel 140, To improve the operating efficiency and to prevent deformation in advance.

That is, when the main and auxiliary sharers 130 and 140 bump against the obstacle in the smooth operation of the non-nonsurface, they are twisted in the left and right direction. At this time, since the turning holes 121 and 150a can rotate in the left- It is possible to prevent breakage and deformation of the harness 130, the auxiliary harness 140, and the connecting frame 120.

At this time, the pivoting means (121, 150a) may be a pivoting means having various structures, but in the present invention, a known ball joint or a link ball capable of pivoting in the up and down and left and right directions is used.

6, the main harness 130 includes a harness frame 131 and a plurality of harnesses 132 (see FIG. 6) in the form of bolts fastened to the lower portion of the harness frame 131, The harness 132 has a plurality of flat edges 132a protruding in the longitudinal direction at a lower portion thereof and a bolt coupling hole 132c at an upper portion and a plurality of drainage grooves 132b in a longitudinal direction .

The stopper 133 is further formed on both sides of the main serrated shaft 130 so that the auxiliary serrated serrated shaft 140 is prevented from rotating at a predetermined angle (90 to 100 °) or more.

At this time, the stopper 133 may pass the wire rope 160 while supporting the wire rope 160 on one side to prevent peripheral interference.

7, the sub-harness 140 includes a harness frame 141 and a plurality of harnesses 142 connected to the lower portion of the harness frame 141 by bolts. A plurality of flat blades 142a protruding in the longitudinal direction at a lower portion thereof and a bolt coupling hole 142c at an upper portion and a plurality of drainage grooves 142b in a longitudinal direction are formed.

At this time, an earthen guide plate 143 may be further formed on the outer side of the auxiliary harness 140 to collect the earthenware in the inward direction during the flat work process.

Particularly, the flat blades 132a and 142a can form a water path in the course of a smooth operation of the non-nons so that the soil can be efficiently drained through the drain grooves 132b and 142b.

In the present invention, the main and auxiliary harrows 130 and 140 are made of aluminum to minimize weight and improve corrosion resistance and durability. At this time, the harness 130 and the connection frame 120 Aluminum profiles were applied.

Therefore, the main and auxiliary sharers 130 and 140 are made of aluminum to minimize the overall weight, thereby increasing the operating efficiency. In addition, since the damaged harness can be quickly replaced, It becomes possible to maximize it.

In the present invention, the guide bar 152 is configured to smoothly guide the moving bracket 154 and the wire rope moving tool 155 in the forward and backward directions.

It is preferable that the guide bar 152 is formed in a polygonal shape except for the circular shape in the sectional view. This is because when the moving bracket 154 and the wire rope moving member 155 are moved, In order to prevent the problem of twisting.

The elevating guide bar 153 and the elevating guiding jaw 153b may be used to move the moving bracket 154 and the wire rope moving device 155 in the forward and backward directions simultaneously with the operation of the hydraulic cylinder 150 It is an important configuration.

13, when the piston rod of the hydraulic cylinder 150 advances, the up-and-down guide bar 153 is advanced at the same time. At this time, The moving bracket 154 which is in close contact with the wire rope holder 153b is in a state in which the wire rope moving tool 155 pulling the wire rope 160 is supported from behind in order to maintain the folded state of the auxiliary harness 140. Consequently, The movable bracket 154 and the wire rope moving member 155 move the guide bar 152 in the same direction and at the same time, Therefore, it moves forward.

The wire rope moving part 155 and the moving bracket 154 are connected to the auxiliary rope 160 connected to the wire rope 160, By the tensile force pulled by the self-load of the spring 140.

Therefore, the lifting guide bar 153 does not need to be manufactured to correspond to the stroke distance of the hydraulic cylinder 150 unnecessarily, so that durability against deformation and reliability of operation can be ensured.

14, when the piston rod is moved backward by the operation of the hydraulic cylinder 150, the up-and-down guide bar 153 is moved backward. At this time, the up-and- The moving bracket 154 and the wire rope moving port 155 are sequentially moved backward to pull the wire rope 160 so that the auxiliary harness 140 can be folded .

As described above, the rising guide 153b is a very important component that is indispensable for transmitting driving force for folding the sub-harvester 140 in the present invention.

It is preferable that the wire rope moving tool 155 is formed so as to be able to move independently along the guide bar 152. This is because in the flat operation of the non-nons, one auxiliary sub- So that the auxiliary harness 140 can be unfolded.

In other words, in the case of the non-knot edge, since both the auxiliary sub-harvesters 140 can not be opened, the sub-sub-harvester 140 is folded and the auxiliary sub-harness 140 is unfolded.

It will be appreciated that a rubber or synthetic resin case is formed on the outer diameter of the wire rope 160 to prevent corrosion and adherence of foreign matter.

It will be appreciated that the latching shaft 155a projects outwardly in order to connect the wire rope 160 and clamp the clamp 170 to prevent the auxiliary harness 140 from being unfolded.

At this time, the clamp 170 is formed to have a claw shape so as to smoothly fit into the outer diameter of the catch shaft 155a.

11, when the worker presses the lever 172, the clamp 170 moves the clamped wire 170 forward by rotating the wire rope 171 connected to the clamping shaft 155a, Respectively.

On the contrary, when the operator lifts the lever 172, the clamp 170 is lifted and the wire rope moving tool 155 can move in the front-rear direction.

Therefore, as shown in FIG. 15, the operator can selectively fold or unfold the auxiliary harrow 140, and the main harrow 130 can be folded up and down only in the folded state of the auxiliary harness 140 .

At this time, the lever 172 may be installed on the upper portion of the coupling frame 110, or may be installed in a cab of the tractor 10 so that the operator can easily operate the lever 172.

Meanwhile, the guide bracket 180 and the guide rod 181 are very important components for increasing the flatness efficiency of the non-nons by allowing the main harness 130 to be bent forward at a predetermined angle.

12, the main sled 130 descends in a downward direction and is inclined diagonally in an oblique direction according to the stroke distance of the hydraulic cylinder 150. At this time, The guide bar 181 is rotated downward with respect to the hinge shaft 181a.

Therefore, by performing more flattening work on the soil by using the main and auxiliary harrows 130 and 140 bent in the downward direction, the work efficiency can be increased.

In particular, the guide rod 181 may be inserted into the guide bracket 180 to move forward or backward according to the operation of the hydraulic cylinder 150. At this time, Since the nut is in contact with the guide bracket 180 in the process of advancing the guide rod 181 by adjusting the nut after the screw is tightened to the helical portion and the operator tightens the nut, So that it is possible to adjust the angle of rotation.

In addition, a horizontal angle adjustment member 190 is formed to present a method for adjusting the horizontal angle of the auxiliary harness 140. The horizontal angle adjustment member 190 is configured such that the hinge axis A main body 191 having an elongated hole 191a formed on the other side so as to be rotatable by inserting the auxiliary harness 140 and the main body 191, A hinge shaft 192 for rotating the hinge shaft 192 in a downward direction and a fastener 193 for fixing the auxiliary harness 140 pivoting about the hinge shaft 192 inserted in the long hole 191a, And an angle adjuster 194 formed at an upper portion of the body 191 for adjusting the rotation angle of the auxiliary harrow 140 in the upper and lower directions.

Therefore, in order to adjust the angle of the auxiliary harness 140 which can not be maintained in the horizontal state due to the wear of the hinge shaft 131a, as shown in FIG. 9, the operator rotates the coupling tool 193 to release the binding force The angle adjuster 194 is operated to rotate the auxiliary harrow 140 in the upward or downward direction to adjust the overall horizontal angle.

On the contrary, after adjusting the horizontal angle of the auxiliary harrow 140, the auxiliary harrow 140 is rotated to rotate the coupling hole 193 to prevent the rotation.

At this time, it is preferable that the fastening tool 193 and the angle adjusting tool 194 use a screw that can be easily operated by an operator and can be moved forward or backward to be fixed and separated according to the rotating direction.

The long hole 191a is used to determine an angle of rotation and a range of rotation of the auxiliary harness 140. For this purpose, Shaped.

Although the embodiments of the present invention have been described above in detail, it is to be understood that the scope of the present invention is not limited to the above embodiments and that various changes and modifications may be made without departing from the scope of the present invention. It will be natural.

The present invention has an advantage that reliability of operation can be ensured by pulling or pushing a wire rope by using a hydraulic cylinder so that the auxiliary harrow can be folded or unfolded.

The present invention has the advantage that the auxiliary harrow can be efficiently folded or unfolded by forming a clamp on both sides of the hydraulic cylinder and fixing the wire rope moving rod to which the wire rope is connected.

The present invention is advantageous in that an effective pivoting angle of the main and auxiliary harrows can be ensured by forming a turning hole capable of freely rotating in the horizontal direction as well as the vertical direction at the joining frame, the hydraulic cylinder, Respectively.

The present invention has the advantage of minimizing the weight and increasing the durability by manufacturing the main and sub harrows and the harness with profiles and aluminum materials.

The present invention is advantageous in that the front and rear angles of the main and auxiliary harrows can be adjusted to increase the flatness efficiency of the non-nons.

The present invention is a very useful invention which can simplify the structure and easy maintenance and maximize the utilization range and efficiency of use.

Claims (10)

A coupling frame 110 installed at the rear of the rotor 20 and a pair of connection frames 120 connected to the pivot holes 121 formed on both sides of the coupling frame 110 so as to be pivotable in up- A main harness 130 installed at the front end of the connecting frame 120 and a pair of auxiliary harrows 140 folded or unfolded on the basis of a hinge shaft 131a formed on both sides of the main harness 130 And a piston rod at the tip end is connected to a bracket 151 provided in the middle of the main shaft 130. The piston rod is connected to a coupling hole 150a formed in the middle of the coupling frame 110, A guide bar 152 formed on both sides of the hydraulic cylinder 150 in a longitudinal direction and connected to the piston rod of the hydraulic cylinder 150 in a longitudinal direction, (153a), and a rising guiding jaw (153b) A moving bracket 154 which is inserted into the guide bar 152 and the upward guide bar 153 and moves only between the departure prevention jaw 153a and the upward guide jaw 153b, A wire rope moving member 155 inserted into the guide bar 152 to closely contact one end of the moving bracket 154 and forming a locking shaft 155a so as to protrude outwardly; And the other end of the wire rope 160 is installed on one side of the auxiliary harness 140 and the guide rods 160 are formed on both sides of the guide bar 152 so that an operator manually manipulates the lever 172, A clamp 170 for pulling or pushing the engaging frame 110 by pulling or pushing the engaging frame 110 to engage with the engaging shaft 155a; A guide rod 181 rotatable with respect to the hinge shaft 181a And a horizontal angle adjusting member 190 connected to the hinge shaft 131a so as to be rotatable to adjust the horizontal angle of the auxiliary harrow 140 The horizontal angle adjustment member 190 includes a body 191 having a long hole 191a formed at one side thereof to be rotatable by inserting the hinge shaft 131a therein, A hinge shaft 192 for coupling the body 191 to each other to rotate the auxiliary harrow 140 in the upper and lower directions and an auxiliary shaft 192 inserted into the elongated hole 191a to rotate about the hinge shaft 192, An angle adjuster 193 for adjusting the angle of the auxiliary harness 140 formed on the body 191 and rotating about the hinge shaft 192, (194) of the wire rope for tractor Folding harrow. 2. The wire rope folding type harness for a tractor according to claim 1, wherein a known ball joint or a link ball is used as the turning hole (121, 150a). The main harness (130) according to claim 1, wherein the main harrow (130) comprises a harness frame (131) and a plurality of harnesses (132) coupled to a lower portion of the harness frame (131) And a plurality of drainage grooves 132b are formed in the upper part of the flat blade 132a and the bolt coupling hole 132c in the longitudinal direction. harrow. 4. The tractor according to claim 3, wherein a stopper (133) is formed on both sides of the main harrow (130) to prevent the auxiliary harrow (140) Folding harrow. The auxiliary harness (140) according to claim 1, wherein the auxiliary harrow (140) comprises a harness frame (141) and a plurality of harnesses (142) coupled to the lower portion of the harness frame (141) And a plurality of drainage grooves 142b are formed in the upper portion of the flat blade 142a and the bolt coupling hole 142c in the longitudinal direction. harrow. The wire rope folding type harness for a tractor according to claim 3 or 5, wherein the harness frame (131, 141) is manufactured using a known aluminum profile. [5] The tractor wire rope folding type harness according to claim 1, wherein an earthen guide plate (143) for collecting the soil in the inward direction is further formed on the outer side of the auxiliary harrow (140). 2. The wire rope folding type harness according to claim 1, wherein the main and auxiliary harrows (130) and (140) are made of aluminum to minimize weight and improve corrosion resistance and durability. delete delete

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