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Publication numberCN104325045 B
Publication typeGrant
Application numberCN 201410443489
Publication date7 Sep 2016
Filing date2 Sep 2014
Priority date2 Sep 2014
Also published asCN104325045A
Publication number201410443489.X, CN 104325045 B, CN 104325045B, CN 201410443489, CN-B-104325045, CN104325045 B, CN104325045B, CN201410443489, CN201410443489.X
Inventors吴家集, 黄共才
Applicant吴家集
Export CitationBiBTeX, EndNote, RefMan
External Links: SIPO, Espacenet
液压无齿弯曲机构 Hydraulic toothless bending mechanism translated from Chinese
CN 104325045 B
Abstract  translated from Chinese
本发明公开了一种液压无齿弯曲机构,包括弯曲体、连杆装置和液压缸,液压缸包括活塞杆,活塞杆与连杆装置的一端相连接,弯曲体包括转轴,连杆装置的另一端与转轴相连接,连杆装置内侧开设有倒角,活塞杆的轴心线位于连杆装置的轴心线的外侧。 The present invention discloses a hydraulic toothless bending mechanism comprises a curved body, a hydraulic cylinder and rod means, one end of the hydraulic cylinder includes a piston rod and a piston rod connected to the link means, comprising a curved body shaft, the other linkage One end of the rotary shaft is connected to inner link chamfered opening means, located outside the axis of the piston rod axis of the rod means. 液压缸的活塞杆推动连杆装置,再带动弯曲体的转轴转动,从而可以通过控制液压缸的液压实现对连杆的推动和转轴的转动。 Hydraulic cylinder piston push rod means, then drive shaft rotating curved body, thereby enabling the rotation of the shaft and the connecting rod driven by a hydraulic control hydraulic cylinders. 本发明公开的液压无齿弯曲机构具有结构简单,弯曲效率高,制造成本低,提高了使用寿命和工作的可靠性的特点。 The present invention discloses a hydraulic toothless bending mechanism has a simple structure, high bending efficiency, low manufacturing costs and improve the life and work of the reliability features.
Claims(4)  translated from Chinese
1.液压无齿弯曲机构,其中,包括弯曲体(I)、连杆装置(2)和液压缸(3),所述液压缸(3)包括活塞杆(31),所述活塞杆(31)与连杆装置(2)的一端相连接,所述弯曲体(I)包括转轴(U),所述连杆装置(2)的另一端与转轴(11)相连接,所述连杆装置(2)内侧开设有倒角(21),所述活塞杆(31)的轴心线(311)位于连杆装置(2)的轴心线(24)的外侧,所述连杆装置⑵包括外杆(22)和内杆(23),所述外杆(22)位于内杆(23)两侧,所述外杆(22)与内杆(23)固定连接,所述外杆(22)包括第一杆(221)和第二杆(222),所述第一杆(221)和第二杆(222)对称位于内杆(23)的两侧,所述第一杆(221)和第二杆(222)均包括多个依次排列的第一连杆单元(4),所述内杆(23)包括多个依次排列的第二连杆单元(5),所述第二连杆单元(5)的轴向长度与第一连杆单元(4)的轴向长度相等,所述第二连杆单元(5)与第一连杆单元(4)交错设置,所述外杆(22)与内杆(23)通过销轴(6)相固定,任一所述第一连杆单元(4)和第二连杆单元(5)均设有两个与销轴(6)对应的通孔(7)。 1. Hydraulic toothless bending mechanism, wherein the body comprises a curved (the I), the link means (2) and the cylinder (3), said hydraulic cylinder (3) comprises a piston rod (31), said piston rod (31 end) and the link means (2) is connected, said curved member (I) comprises a shaft (the U), said link means (2) and the other end of the shaft (11) connected to said linkage means (2) has a chamfered inner opening (21), said piston rod (31) of the axis (311) located on the connecting rod means (2) of the axis (24) of the outer side of said link means comprises ⑵ outer rod (22) and the inner rod (23), the outer rod (22) is located within the lever (23) on both sides, the outer rod (22) and the inner rod (23) fixedly connected to the outer rod (22 ) comprises a first rod (221) and a second rod (222), said first rod (221) and a second rod (222) located symmetrically on both sides of the lever (23), said first rod (221) and a second rod (222) comprises a first plurality of link units arranged sequentially (4), said inner rod (23) comprises a plurality of sequentially arranged second link unit (5), said second connection lever means (5) and the axial length of the first link unit (4) is equal to the axial length of said second link means (5) and the first link unit (4) alternately arranged, the outer rod (22) and the inner rod (23) is fixed by a pin (6), any one of the first link unit (4) and a second link unit (5) are equipped with two pins (6) corresponding through-hole (7).
2.根据权利要求1所述的液压无齿弯曲机构,其中,所述第一连杆单元(4)两端的内侧和第二连杆单元(5)的内侧均开设有倒角(21)。 According to claim 1 wherein the hydraulic toothless bending mechanism, wherein the medial inner (4) at both ends of the first link and the second link unit means (5) are chamfered opening (21).
3.根据权利要求1或2所述的液压无齿弯曲机构,其中,所述弯曲体(I)还包括臂杆(12),所述臂杆(12)与转轴(11)固定连接,所述连杆装置(2)通过臂杆(12)与转轴(11)相连接。 3. The hydraulic 1 or claim 2 wherein the toothless bending mechanism, wherein the curved body (I) further comprises a lever arm (12), the arm (12) and the shaft (11) fixedly connected, by said link means (2) are connected via the arm (12) and the shaft (11).
4.根据权利要求3所述的液压无齿弯曲机构,其中,所述弯曲体(I)还包括限位块(13),所述限位块(13)位于转轴(11) 一侧,所述限位块(13)与销轴(6)对应设置。 4. The hydraulic toothless bending mechanism according to claim 3, wherein said curved body (I) further comprises a stopper (13), said stopper (13) located on the shaft (11) on one side, which said stopper (13) and pin (6) corresponding to the set.
Description  translated from Chinese
液压无齿弯曲机构 Hydraulic toothless bending mechanism

技术领域 TECHNICAL FIELD

[0001 ]本发明属于一种线材加工装置,尤其是涉及一种液压无齿弯曲机构。 [0001] The present invention pertains to a wire processing apparatus, and more particularly to a hydraulic bending toothless institution.

背景技术 Background technique

[0002]弯曲机构通常是指弯曲360以内的机构,使用范围广,通常采用减速机构带动转轴转动,通过齿轮齿条的旋转运动实现对待弯曲材料的弯曲,结构复杂,制造成本高;且通过齿轮齿条传动易出现啮合时齿的断裂,影响使用寿命。 [0002] bending mechanism usually refers to the bending mechanism 360 or less, using a wide range of commonly used reduction mechanism driven shaft is rotated by the rotary movement of the gear rack of realize treat curved bend materials, complex structure, high manufacturing cost; and by rack and pinion prone to fracture when engaging teeth, affecting life. 同时,由于其结构的复杂性,以及整体体积较大,使得有些地方结构受限制,不好实现。 Also, because of its greater complexity, as well as the overall size of the structure, so that in some places restricted structure, poor implementation.

发明内容 SUMMARY

[0003]本发明的目的在于提供一种液压无齿弯曲机构,可以解决上述技术问题中的至少一个。 [0003] The object of the present invention is to provide a hydraulic toothless bending mechanism, at least one can solve the above problems.

[0004]根据本发明的一个方面,提供了一种液压无齿弯曲机构,包括弯曲体、连杆装置和液压缸,液压缸包括活塞杆,活塞杆与连杆装置的一端相连接,弯曲体包括转轴,连杆装置的另一端与转轴相连接,连杆装置内侧开设有倒角,活塞杆的轴心线位于连杆装置的轴心线的外侧。 [0004] In accordance with one aspect of the present invention, there is provided a hydraulic toothless bending mechanism comprises a curved body, a hydraulic cylinder and rod means, one end of the hydraulic cylinder comprising a piston rod, the piston rod means connected flexure includes shaft, the other end of the connecting rod means is connected to the rotary shaft, chamfered inner link up means, located outside the axis of the piston rod axis of the rod means.

[0005]本发明的有益效果是:液压缸的活塞杆推动连杆装置,再带动弯曲体的转轴转动,从而可以通过控制液压缸的液压实现对连杆的推动,减少了减速机构的使用,简化整体结构;活塞杆的轴心线位于连杆装置的轴心线的外侧,使得活塞杆在开始推动连杆装置时,在活塞杆的作用力下,连杆装置不会弯曲,保证连杆装置能够有效推动转轴转动,提高了弯曲效率;连杆装置内侧设有倒角,可以使得其推动转轴转动后,连杆装置向倒角一侧弯曲,保证转轴的转动。 [0005] The beneficial effects of the present invention are: hydraulic cylinder piston push rod means, then drive shaft bent body rotation, which can be achieved by controlling the push rod of the hydraulic cylinder, reducing the use of reduction mechanism, simplify the overall structure; located outside of the piston rod axis linkage axis line, so that the piston rod at the beginning of the push link means in the piston rod of the force, will not bend linkage, ensure link means to effectively promote the rotation shaft to improve the efficiency of bending; inner link device is provided with a chamfer, so that it can push back axis of rotation, the link means is bent toward the side of the chamfered to ensure a rotation shaft. 由此,本发明的液压无齿弯曲机构减少了对减速机构和齿轮齿条的使用,结构简单,降低了制造成本,以及提高了使用寿命和工作的可靠性。 Accordingly, the present invention is toothless hydraulic bending mechanism to reduce the use of rack and gear reduction mechanism, simple structure, reduce manufacturing costs and improve the reliability and service life of the work.

[0006]在一些实施方式中,连杆装置可以包括外杆和内杆,外杆位于内杆两侧,外杆与内杆固定连接。 [0006] In some embodiments, the linking means may comprise an outer lever and an inner lever rod inside the outer lever is located on both sides, the inner rod and outer rod is fixedly connected. 由此,设有内杆和外杆,可以将活塞杆作用在连杆装置上的力更好的传递,受力效果好。 Thus, provided with an inner rod and outer rod, the rod may be acting on the linkage force better passing by force good effect.

[0007]在一些实施方式中,外杆可以包括第一杆和第二杆,第一杆和第二杆对称位于内杆的两侧,第一杆和第二杆均包括多个依次排列的第一连杆单元。 [0007] In some embodiments, the outer bar may comprise a first lever and a second lever, the first lever and located symmetrically on both sides of the inner rod of the second rod, the first and second rods each comprise a plurality of sequentially arranged the first link unit. 由此,方便外杆的各第一连杆单元的作用力的传递,同时方便外杆的弯曲。 Thus, to facilitate transfer force of each of the first link of the outer rod element, while the outer rod to facilitate bending.

[0008]在一些实施方式中,内杆可以包括多个依次排列的第二连杆单元,第二连杆单元的轴向长度与第一连杆单元的轴向长度相等,第二连杆单元与第一连杆单元交错设置。 [0008] In some embodiments, the rod may include a second plurality of link units arranged in sequence, an axial length of the axial length of the second link unit is equal to the first link unit, a second link unit staggered with the first link unit. 由此,方便内杆和外杆的均匀受力,以及方便第一连杆单元和第二连杆单元的连接。 Thus, even by force inside and outside the convenient lever bar, as well as easy to connect the first link unit and a second link unit.

[0009]在一些实施方式中,第一连杆单元两端的内侧和第二连杆单元的内侧均开设有倒角。 [0009] In some embodiments, the inner ends of the inner side of the first link and the second link unit cell are chamfered opening. 由此,可以使得第一连杆单元和第二连杆单元在弯曲时,方便向内侧弯曲。 Thereby, such that the first link and the second link unit means during bending to facilitate bending inwardly.

[0010]在一些实施方式中,外杆与内杆通过销轴相固定,任一第一连杆单元和第二连杆单元均设有两个与销轴对应的通孔。 [0010] In some embodiments, the outer rod and the inner rod is fixed by pin, a first link any unit and the second unit has a link with two pins corresponding through holes. 由此,设有销轴和通孔,方便外杆与内杆的固定。 Thus, with a pin and the through holes to facilitate fixed outer rod and the inner rod.

[0011]在一些实施方式中,弯曲体还可以包括臂杆,臂杆与转轴固定连接,连杆装置通过臂杆与转轴相连接。 [0011] In some embodiments, may further include a flexure arm, the arm is fixedly connected with the rotary shaft, the link arm by means connected with the rotary shaft. 由此,设有臂杆可以方便转轴与连杆装置的连接。 Thus, the arm can be easily connected with a shaft and connecting rod device.

[0012]在一些实施方式中,弯曲体还可以包括限位块,限位块位于转轴一侧,限位块与销轴对应设置。 [0012] In some embodiments, the body may also include a curved stopper, the stopper is located in the side of the shaft, the stopper pin with the corresponding setting. 由此,设有限位块可以对销轴进行限位,防止连杆装置向外运动。 Thus, with a stopper pin can be the limit, to prevent outward movement of the connecting rod means.

附图说明 BRIEF DESCRIPTION

[0013]图1是本发明的一种实施方式的主视结构示意图; [0013] FIG. 1 is a schematic front view of the structure of an embodiment of the present invention;

[0014]图2是图1的俯视结构示意图; [0014] FIG. 2 is a top view of FIG. 1;

[0015]图3是本发明的液压无齿弯曲机构中内杆和外杆的配合结构示意图; [0015] FIG. 3 is a hydraulic present invention toothless bending mechanism within the rod and rod outer mating structure schematic;

[0016]图4是本发明的液压无齿弯曲机构中连杆装置与转轴相连接的结构示意图; [0016] FIG. 4 is a hydraulic schematic structural view of the present invention is not connected to the rotary shaft of the gear linkage bending mechanism;

[0017]图5是本发明的液压无齿弯曲机构中弯曲体的结构示意图; [0017] FIG. 5 is a hydraulic structure of the present invention without the curved teeth bent organization charts;

[0018]图6是本发明的液压无齿弯曲机构中通孔的侧视结构示意图。 [0018] FIG. 6 of the present invention is a hydraulic schematic structure without side teeth bending mechanism in the through hole.

具体实施方式 detailed description

[0019]下面结合附图对本发明作进一步详细的说明。 [0019] the following with reference to the present invention will be further described in detail.

[0020]参照图1和图2:液压无齿弯曲机构,包括弯曲体1、连杆装置2和液压缸3,液压缸3包括活塞杆31,活塞杆31与连杆装置2的一端通过销轴相连接。 [0020] Referring to Figures 1 and 2: no gear hydraulic bending mechanism comprising a bending member, the link device 2 and a cylinder 3, the cylinder 3 comprises a piston rod 31, one end of the piston rod 31 and the link device 2 through a pin connected to the shaft. 弯曲体I包括转轴11,连杆装置2的另一端与转轴11相连接,连杆装置2内侧开设有倒角21,活塞杆31的轴心线311位于连杆装置2的轴心线24的外侧。 I comprises a body 11 bent shaft, the other end of the link means 2 is connected to the rotary shaft 11, the link means 2 is chamfered inner opening 21, the axis of the piston rod 31 of the linkage assembly 311 is located at the axis 24 of the 2 outside. 本发明的液压无齿弯曲机构在工作时,液压缸3中的液压逐渐增加,活塞杆31在液压的作用下向连杆装置2—侧移动。 Hydraulic present invention toothless bending mechanism at work, the hydraulic cylinders 3 Hydraulic gradually increased, the piston rod 31 move 2- side linkage under the action of hydraulic pressure. 倒角21和活塞杆31的轴心分别位于连杆装置2轴心的相对两侧,使得活塞杆31开始推动连杆装置2时,连杆装置2不弯曲,并随着活塞杆31—同前进,逐渐带动转轴11转动。 The axis of the piston rod 21 and the chamfers 31 are located on opposite sides of the axis of the link means 2, such that when the piston rod 31 starts push link means 2, the link means 2 is not bent, and the piston rods with 31- forward, gradually drive shaft 11 is rotated.

[0021]本发明的液压无齿弯曲机构通过使用液压缸3和连杆装置2可以实现对弯曲体I中的转轴11转动情况的控制,避免使用现有的弯曲机构中的减速机构和齿轮齿条,可以通过连杆装置2的传动带动转轴11转动。 [0021] The present invention is a hydraulic mechanism using toothless bending cylinder 3 and the link means 2 can be achieved on the flexure shaft 11 is rotated in the I control of the situation, to avoid the use of conventional bending mechanism and the gear reduction mechanism Article 2 of the drive can be driven shaft 11 is rotated through the linkage. 本发明的液压无齿弯曲机构可以适用于液压钢筋弯箍机和液压弯管机等弯曲机械。 Hydraulic present invention toothless bending mechanism can be applied to hydraulic steel hoop bending machine and hydraulic pipe bending machines and other machinery.

[0022] 如图3和图4所示,连杆装置2包括外杆22和内杆23,外杆22位于内杆23两侧,为了保证连杆装置2的强度,内杆23的径向厚度为外杆22径向厚度的两倍。 [0022] Figures 3 and 4, the link device 2 comprises an outer stem 22 and inner rod 23, the outer lever 23 is located on both sides of the inner rod 22, in order to ensure the strength of the link means 2, the inner rod 23 of the radial twice the thickness of the outer lever 22 of the radial thickness. 外杆22与内杆23固定连接,外杆22与内杆23通过销轴6相固定。 Outer rod 22 is fixedly connected with the inner rod 23, the rod 22 and the outer lever 23 by a pin 6 is fixed.

[0023] 外杆22包括第一杆221和第二杆222,第一杆221和第二杆222对称位于内杆23的两侧,第一杆221和第二杆222均包括多个依次排列的第一连杆单元4。 [0023] The lever 22 comprises a first outer rod 221 and second rod 222, first rod 221 and second rod 222 located symmetrically on both sides of the lever 23, the first rod 221 and second rod 222 includes a plurality of sequentially arranged the first link unit 4.

[0024]内杆23包括多个依次排列的第二连杆单元5,第二连杆单元5的轴向长度与第一连杆单元4的轴向长度相等。 [0024] The inner rod 23 includes a plurality of sequentially arranged second link unit 5, the axial length of the axial length of the second link unit 5 and the first link unit is equal to 4. 第二连杆单元5与第一连杆单元4交错设置,即多个第二连杆单元5组成的内杆23与多个第一连杆单元4组成的外杆22后,外杆22的两端面均超出内杆23相应的两端面的距离等于第二连杆单元5轴向长度的一半,使得第二连杆单元5和第一连杆单元4之间的作用力可以相互传动。 Second link unit 5 and the first link unit 4 alternately arranged, i.e., a plurality of second link unit 5 composed of an outer rear inner rod 23 and the rod 4 consisting of a plurality of first link elements 22, 22 of the outer rod both end faces of the inner rod 23 are beyond the end faces of the corresponding distance equal to one half the axial length of the second link unit 5 so that the second link unit 5 and the first link unit biasing force between 2-4 can drive each other. 其中外杆22的两端超出内杆23的两端。 Wherein the outer ends of the rod 22 beyond the ends of the inner rod 23.

[0025] 如图3和图6所示,任一第一连杆单元4和第二连杆单元5均设有两个与销轴6对应的通孔7,两个通孔7的中心距离为第一连杆单元4或第二连杆单元5轴向长度的一半,两个通孔7大小相等,销轴6贯穿通孔7将第一连杆单元4和第二连杆单元5进行固定,外杆22和内杆23通过销轴6完成连接。 [0025] As shown in Figures 3 and 6, either a first link 4 and second link unit has two units 5 and pin 7 through holes 6 corresponding to the center distance between the two through holes 7 half of the first link or the second link 4 unit axial length of the element 5, two through holes 7 are of equal size, the pin 7 through holes 6 through the first link and the second link unit 4 unit 5 fixed outer rod 22 and inner rod 23 by a pin 6 to complete the connection.

[0026]第一连杆单元4两端的内侧和第二连杆单元5的内侧均开设有倒角21,各倒角21的大小相等。 Inner [0026] The first link unit 4 and the inner ends of the second link unit 5 are chamfered opening 21, 21 is equal to the size of each chamfer.

[0027]如图5所示,弯曲体I还包括臂杆12,臂杆12焊接在转轴11的中部,连杆装置2通过臂杆12与转轴11相连接。 [0027] 5, further comprising I flexure arm 12, the arm 12 is welded to the central shaft 11, the link device 2 through the arm 12 and the rotary shaft 11 is connected. 连杆装置2的一端通过外杆22与活塞杆31通过销轴6固定连接,活塞杆31上开设有与销轴6相配合的安装孔;连杆装置2的另一端通过外杆22与臂杆12通过销轴6固定连接,臂杆12上开设有与销轴6相配合的安装孔。 One end of the link device 2 through the outer rod 22 and the piston rod 31 by a pin 6 is fixedly connected with the piston rod opened a 6 pin mounting holes mate 31; the other end of the link device 2 through the outer lever 22 and the arm rod 12 is fixedly connected through pin 6, with the creation of a pin mounting hole 6 fitted on the arm 12.

[0028]弯曲体I还包括限位块13,限位块13位于转轴11 一侧,限位块13与销轴6对应设置,即限位块13对销轴6进行限位;限位块13有两块,分别与销轴6的上下两端相接触。 [0028] I bent body further comprises stopper 13, the stopper 13 is located in the side of the shaft 11, the stopper 13 corresponds with the pin 6 is provided, that is, 13 pairs of stopper pin 6 limit; stopper 13 has two, respectively upper and lower ends in contact with the pin 6. 为了方便销轴6与限位块13相接触,在销轴6的两端分别依次套设有卡圈8和套圈9,当销轴6与限位块13接触时,限位块13将销轴6的两端进行限位,防止连杆装置2向外侧(即原理转轴11 一侧)运动,保证了连杆装置2正常推动转轴11转动。 In order to facilitate the stopper pin 6 and 13 in contact with both ends of the pin 6 sequentially sets are provided with the collar ring 8 and 9, when the pin 6 and the stopper 13 contacts stopper 13 performed at both ends of the pin 6 limit to prevent the link means 2 to the outside (ie, the principle of rotating shaft 11 side) motion, to ensure the normal link means 2 push shaft 11 is rotated.

[0029]为了方便弯曲体I中转轴11和限位块13的安装和固定,弯曲体I还包括壳体14和围板15,围板15套设在壳体14的外侧,转轴11套设在壳体14内,限位块13焊接固定在围板15上。 [0029] In order to facilitate the bending of the shaft 11 and the body I stopper mounting and fixing, I bent body 13 also includes a housing 14 and 15 panels, 15 panels arranged around the outside of the housing 14, the shaft 11 is sheathed within the housing 14, the stopper 13 welded and fixed to the dash panel 15.

[0030]本发明的液压无齿弯曲机构在工作时,液压缸3内的液压作用推动活塞杆31向外移动,活塞杆31开始推动外杆22,外杆22和内杆23—同移动,且外杆22和内杆23不弯曲;外杆22的另一端与臂杆12连接,外杆22通过臂杆12带动转轴11转动。 [0030] Hydraulic bending mechanism of the present invention without teeth during operation, the hydraulic cylinder hydraulically driven piston rod 3 within 31 moves outwardly, the piston rod 31 starts pushing the outer lever 22, the outer rod 22 and inner rod with 23- to move, the rod 22 and the outer and inner rod 23 is not bent; outer rod 12 is connected with the other end of the arm 22, the outer lever arm 2212 driven by rotation of the shaft 11. 随着转轴11的转动,外杆22和内杆23围绕转轴11的中心转动,外杆22和内杆23向倒角21—侧弯曲;同时,限位块13对销轴6进行限位,使得外杆22和内杆23只能向转轴11 一侧弯曲。 With the rotation of the shaft 11, the outer rod 22 and inner rod 23 is rotated around the central axis 11 of the outer rod 22 and inner rod 23 is bent chamfer 21- side; at the same time, the stopper 13 pairs 6 pin limit, so that the outer rod 22 and inner rod 23 can only be bent to the side of the shaft 11. 活塞杆31的行程越大,外杆22和内杆23推动转轴11转动的角度越多,弯曲体I对待弯曲产品的弯曲角度就越大。 The larger the stroke of the piston rod 31, the rod 22 and the outer push rod 23 within the shaft 11 is rotated an angle, the more the bending angle of the bent bending body I towards the product will be. 当弯曲体I完成对产品的弯曲后,活塞杆31缩回,活塞杆31拉动连杆装置2,并带动转轴11反转,实现了弯曲功能。 When I complete bending bent body of the product, the piston rod 31 is retracted, pulling the rod linkage 31 2, 11 and drive shaft reversal achieve bending function.

[0031]以上所述的仅是本发明的优选实施方式,应当指出,对于本领域的普通技术人员来说,在不脱离本发明创造构思的前提下,还可以做出若干变形和改进,这些都属于本发明的保护范围。 [0031] The above are only preferred embodiments of the present invention, it should be noted that those of ordinary skill in the art, in the present invention without departing from the idea of the creation of the premise, you can also make a number of modifications and improvements, which fall within the protection scope of the present invention.

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Classifications
International ClassificationB21F1/00
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