SU1269876A2 - Arrangement for bending parts - Google Patents

Abstract

DEVICE FOR BENDING DETAILS, mainly clamps for drawings, according to auth.St. No. 1222353, differing from the fact that, in order to improve the quality and ease of maintenance, it is equipped with a tension mechanism of the workpiece, made in the form of a ratchet wheel rigidly connected to the lower shaft, a hinged lever mounted on a bed, a doggie, St. Evoya; a lever with a ratchet wheel, an eccentric attached to the free end of the upper shaft, and a rod through which this eccentric is connected to the lever.

Description

1 Invention relates to the processing of metals by pressure, in particular, to devices and accessories for flexible parts such as clamps for drawings. The purpose of the invention is quality and serviceability. FIG. 1 shows the proposed device, with a sectional view; figure 2 is a view along arrow L in figure 1; FIG. 3 is a view along arrow L in FIG. Fig. 4 is a view along arrow B in Fig. 1; Fig. 5 is a view along arrow B of Fig. 1 (after making the clip for the drawings); rta 6 - And schematically shows the various stages of operation of the device in figure 2 view along arrow G in figure 4; in FIG. I3, a clip for the drawings, side view. The device contains a frame 1, made in the form of a cylinder with an annular sample 2, and rigidly attached (for example, electric welding) to its side surface 3 (figure 2) with a base 4 in the form of a plate. A cylindrical sample 5 is made coaxially to the geometric axis of the bed, where a rotary shaft 6 is installed with a longitudinal through groove 7 (groove dimensions are selected along the workpiece; clamp) at one end and an annular protrusion 8 to prevent axial movement of the shaft to the right. The second end 9 of the shaft has a smaller diameter and a ratchet wheel 10 is rigidly seated on it, the hub which prevents axial movement of the rotary shaft to the left. Closer to the periphery of the ratchet wheel there is a threaded sample 12, into which the axis 13 is wrapped, carrying the handle 14, which is kept from axial movement by the axis head 15. Above the rotary shaft 6, parallel to it, another cylindrical sample 16 is made on it, where the swing shaft 17 is mounted, one horse which protrudes above the longitudinal through groove 7 of the rotary shaft and has a longitudinal through groove 18 to ensure quick insertion of the grooves 7 and 18 shafts are removed conic chamfer 19 and two flat chamfers 20. Through an annular sample 5 of the bed on the swing shaft, a threaded sample is made, where the thread part of the handle 2 with the ball handle 22, n 62 of its free end, is returned. To prevent oceBoio shaking, wah: tapping diam. An extra trick 23 passes through a hole of a gigi 24 made of a rectangular rod with two holes at the ends. In the right part of the frame (Fig. 3) there is a somewhat horizontal axis of symmetry and at some distance from the teeth 25 of the ratchet wheel sample, where the semi-axle 26, the holding lever 27 is wrapped. Between the pin 27 and the end surface of the frame on the half-axle 26, a spacing sleeve 28 is installed. The lever is kept from falling out by the semi-axle head 29. In the hole made at a distance h (Fig. 7, where) from the half axis 26 on the lever 27, a thickened part of the half axis 30 is pressed in. The half shaft 30 is made with a head and enters the hole made on the rod. The length of the rod 24 and the lever 27 is chosen such that between them there is an angle approximately equal to 160, and that the lever 27 does not touch the teeth 25 of the ratchet wheel. At the upper end of the lever 27, a groove 31 is made, where the pawl 34 (fig. 3), which interacts with the teeth of the wheel, is hinged with the axis 32 and the nut 33. The length of the pawl and lever are chosen constructively depending on the size for the drawings and so that in the manufacture of clamps (after turning the swing shaft to the lowest position), the turns of the spiral spring 35 (Fig. 13) tightly twist on the rotary shaft 6, and the middle part 36 pulled along the straight line. To fix the swing shaft 17 in the extreme positions on the frame, there are fingers lugs 37, which are pressed into the holes on the frame. The stops are mounted so that the handle 21 turns the swinging shaft through an angle of 91–93. Under the turning shaft 6, the support 4 is rigidly attached to the base 4 of the frame by means of two screws 38, an elastic stop 39, made from an elastic plate bent in the form of a bracket. The middle part of the stop is constantly pressed against the cylindrical surface of the rotary shaft. At the end of the bed 1, facing the resilient abutment, between the protruding ends of the rotary shaft and the rocking shaft, a double-shouldered lever 41 is installed on the axis 40, the right part 42 of which serves as a holder, and the left 43 is made thinner and serves to release the clamp made on the drawing device . Axis 40 is installed in 44 holes diametrically drilled on the screw head. The screw is wrapped in the body stanin. The device works as follows. At the initial moment, the handle 21 is in the vertical position, and the handle 14 is in the lower extreme position. At the same time, the grooves 7 and 18 of the 17 and rotary 6 shafts are vertically aligned. In these slots, the workpiece 45 is clamped with a steel tape, which is kept from moving downwards by an elastic stop 39. Then, by the handle 14, the turning shaft 6 is rotated counterclockwise. The lower end of the belt 45, while living in the groove 7, rotates and the belt, which is held from turning by the stacks of the groove 18 of the swing shaft 17, is folded at the point of exit from the groove 7. Then, as the shaft 6 rotates, the tape is wound on it. The shaft rotates on the shaft 6 at some angle from the shaft 17. When the shaft 6 rotates, the ratchet wheel 10 rigidly seated on it rotates and the hinged but fixed dog 34 under its own weight slides 25 teeth 25. After the upper end of the tape coincides with the lateral surface shaft 17 ends turning va 6. The coil spring 35 is not wound on the shaft 6, since the pawl 34, which rests against the ratchet wheel 35 and thereby prevents the ratchet wheel and va rigidly mounted on it and 6 clockwise. Next, form the shelf 46 of the clamp for the drawings. It is done like this. By the handle 22 of the handle 21, the shaft 17 is turned clockwise. When the shaft 17 is turned, the eccentric 23 moves along its path 764 to the right and slightly down. At the same time, the tractor ha 24 moves to the right and the lever 27 pivotally connected with it rotates on the axis 26 clockwise. The upper end of the lever and the pawl move up and to the right. Due to the movement of the pawl, the ratchet wheel is rotated clockwise at an angle T from the horizontal by the elasticity of the spiral spring. B, the initial interval of rotation of the shaft I7, the lever 27 is rotated clockwise to a considerable one (several times greater than the angle of rotation of the swinging shaft 17), since the angle f) between the connecting rod 24 and the lever 27 is close to 180 ° and, moreover, the distance t of the lever is greater than the distance h. Therefore, the pawl moves significantly upward and at the same time to the right, ensuring the rotation of the snorkel wheel clockwise under the action of the coils wound on the shaft 6. The spiral spring unfolded in this way, when the shaft 17 is further rotated, does not pull out the upper part of the belt 45, which is located in the groove 18 of the shaft 17 and is bent in the place of its exit. The shaft 6 rotates at a lower angular speed than the shaft 17 (angle 3 U), as the angle 0 (2 approaches the right angle and the eccentric 23 moves slightly to the right and moves the rod to the right. With further rotation of the shaft 17 due to a considerable lag and decrease in the angular velocity of the shaft 6 from the angular velocity of the shaft 17, the middle part 36 of the tape connecting the shelf 46 with the coil spring 35 tenses and when the shaft 17 rotates 90 P the tension comes along the line close to the straight line and the coils of the coil spring pressed close together (Fig. 9). D In order that the angle between the shelf and the middle part of the clamp, due to the elasticity of the tape not be greater than 90 after being released from the device, the shaft 17 is rotated clockwise a few more degrees (depending on the elasticity of the tape (Figure 10) until the handle 21 stops against the stop 37. The clip for the drawings made by the above methods is released from the groove 7 of the shaft 6 by pressing the two shoulders lever 42 on the holder 42. At the same time, the left part 43 of the lever pushes S1 the coil spring 35 of the clip on its face surface. In order to manufacture the next after the sya, the handle 1A is turned counterclockwise (the dog does not prevent the ratchet wheel from turning in this direction) and is stopped in the lowest position. The groove 7 of the shaft 6 is positioned vertically, as well as the groove 18 of the shaft 17. In the proposed device (as a result of supplying it with a Hat mechanism) unwinding the helical 76 spring of the clamp billet in the initial stage of the shelf formation, as well as tensioning the middle part of the clamp the stages are carried out automatically without additional operations, as is done in the selected prototype, which improves the usability and quality of the clamps. Improving the quality of the clamps is determined by the achievement of the same (necessary) dimensions of all the clamps made on the proposed device for the drawings.

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Claims (1)

DEVICE FOR BENDING PARTS, mainly clamps for drawings, according to ed. No. 1222353, characterized in that, in order to improve the quality and ease of maintenance, it is equipped with a workpiece tensioning mechanism made in the form of a ratchet wheel rigidly connected to the lower shaft, a lever pivotally mounted on the bed, a dog linking: a ratchet lever a wheel, an eccentric attached to the free end of the upper shaft, and a rod through which this eccentric is connected to the lever. > to>