(57) Abstract:The invention relates to the heads of the Phillips head screws. The screw head includes a cruciform slot in the form of axial recesses and outgoing four pairs of perpendicularly arranged grooves, between which met the four cavities. The shape of each depression in the plan represents a parabola. The rays of these parabolas intersect with the side surfaces of the grooves, and the distance between the oppositely spaced vertices of the parabolas is equal to 0,85 - 0,9 m, where m is the distance between the extreme points of oppositely located grooves. The intersection of rays of each parabola with the side surfaces of the grooves occurs at the points of minimum distance of these grooves from each other. The result is that the screw head is stably held on the feathers screwdriver, ensures stable torque from the tool to the workpiece and an optimum torque. 1 C.p. f-crystals, 2 Il. The alleged invention relates to the heads of the screws with Phillips, and in particular to the screws protruding heads and slot type H (Phillips), described in GOST 10753-86 "cruciform Slots for bolts and screws". Dimensions and methods of control. Goskomstat the selected slots of the cross slot with mating surfaces of the feather end of a screwdriver, in the result, the screw head slides screwdriver than hampered sustainable retaining screw in position by screwing, especially in the conditions of the conveyor Assembly. In automatic mode it is possible to slice a cross slot or screw heads, or feathers screwdriver.A known design of a cruciform slot type Z /Pozidriv/, described in the same Guest 10753-86, page 4, features. 2, in which between the perpendicular to the grooves of the cross slot is made of vertical and horizontal depression. They are designed to increase torque and partially solve the above problem by holding the head of the screw on the screwdriver, when it created a new design screwdriver, corresponding to the shape of the slot zThe disadvantage of the design is its complexity and the complexity of manufacturing, which is associated with the manufacture of punch:
- with additional elements, leaving the inside of the slot on his ribs;
with asymmetrical rays of angles and that are not equal to;
with the nonlinearity of the beam on the slots with the sphere, because the depth of the beam is strictly defined by the geometry of the building at the start point and the end point.For this design slot need special design of the screwdriver. Ultrasonic examination of the Itza, interacting with a screwdriver.Most closely related to the problem at hand is the construction of a cruciform slot type H, is described in U.S. patent N 3151519 IPC F 16 B 23/00, which to the best of forming the Central part of the cross slot between its radial grooves made four holes (prototype).The basin contains forms also do not facilitate optimal movement of metal in the center of the slot. Edges, and faces of the slot are not fully filled.The disadvantage is the complexity of manufacturing of punches to the landing of the screw head, especially by the method of plastic deformation, the metal flow is impeded.When the wear of the equipment, in mass production of screws configuration of the projections on the punch forming recesses between the grooves may change for the worse, which can lead to incomplete formation of the shape of the cross slot, faces, holding the end of a screwdriver inside the slot.The objective of the proposed invention is maximal and stable retention of the screw head feathers screwdriver, ensuring stable torque from the tool to the workpiece and the achievement of the optimum torque.Another zadorozny slot, easy to manufacture, capable with minimum stress to the maximum fill edges, and faces of the formed cross slot.These objectives are achieved by changing the shape of the depressions, contributing to the maximum displacement of the metal in the center of the slot and a clear molded edges and faces of the latter.In the screw head, containing cross-slot type H, in the form of axial recesses and outgoing four pairs of perpendicularly arranged grooves, between which met the four cavities, each of which in plan represents a parabola, the rays of these parabolas intersect with the side surfaces of the grooves. The intersection occurs at the points of minimum distance above the slots from each other. The distance between two oppositely spaced vertices of the parabolas is equal to 0,85 - 0,9 m, where m is the distance between the extreme points of oppositely located grooves.The intersection of the rays of parabolas with the side planes in pairs perpendicularly spaced grooves that interact with the response, the production tool is a significant contrast to the known constructions. The dependence of the distance between oppositely located virginmobileusa movement of metal in the center of the slot to the working edges, and faces of the grooves and their optimum inflection.Increases the area of the clutch screw driver slot. The metal between the depressions and grooves of the most hardened, increasing the resistance of the slot and feather screwdriver to cut at high torques. The head of the screw is firmly held on the feathers screwdriver.The positive effect is:
- increase the area of engagement of the screwdriver and key, jamming, which leads to strong retention screw on the screwdriver by screwing;
in the hardening faces, and edges between the depressions and grooves of the cross, which leads to increased resistance of the slot to cut at higher torques screwing, leads to the achievement of the maximum tightening torque of the threaded connection, increases the service life of the screwdriver and the screw;
- the design of the slot and forming tool is simple and convenient in fabrication, construction punch reliable and ensures a long service life.In Fig. 1 shows a semicircular head of the screw with a Phillips-type in the plan.In Fig.2 - the same as in Fig.1, cut along a-a view of the cavity of the axial recess.Designations in Fig.1-2 the following:
the semicircular head, 1 Phillips, consisting of axial recesses 2, Otho 5, each of which represents a parabola with 6 of the top 7. Rays parabolas intersect with the side surfaces of the grooves 3 in points 8 and 9.m - the distance between the extreme points of oppositely located grooves 3 cross slot according to GOST 10753 - 86;
d - the distance between the oppositely spaced peaks 7 of the parabola.The customer sets the shape of the head, the slot number and the size "m" slots slot.In this case, the semicircular head Phillips type-N, N 2. Size "m" - 4.0 mmBuild slot according to GOST 10753-86 and determine the point of least distance pairwise perpendicular grooves located from each other - point of the proposed intersection of the parabola with the slots.From the condition d = 0,85 - 0,9 m and build defined on the sphere of vertices oppositely located parabolas, then the depth of the depression.It should be noted that if d < 0,85 m is insufficient formation of working edges and faces of the grooves of the cross slot, the depth of depression decreases.When d > to 0.9 m depth of the trench increases, the resistance of the cross slot is reduced. When large torques screwing a possible cut edges of the cross slot or feathers hole is here, at which the maximum positive effect.The plant of OJSC "ETNA" made an experimental batch of screws with the proposed design of the slot. Tests showed the high quality of the production cross slots and durable mesh them with the tips of the screwdrivers. Screw stably held on the feathers of a screwdriver in the process of screwing into the socket, pushing when high torques are minimized. 1. The screw head with cross slot in the form of axial recesses and outgoing four pairs of perpendicularly arranged grooves, between which met the four cavities, the shape of each depression in the plan represents a parabola, characterized in that the beams of these parabolas intersect with the side surfaces of the grooves, and the distance between the oppositely spaced vertices of the parabolas is equal to 0,85 - 0,9 m, where m is the distance between the extreme points of oppositely located grooves.2. The screw under item 1, characterized in that the intersection of the beams of each parabola with the side surfaces of the grooves occurs at the points of minimum distance of these grooves from each other.
FIELD: mechanical engineering.
SUBSTANCE: fastening member comprises housing provided with the axle which has polyhedral cross-section bounded by the wall of the periphery, polyhedral central section arranged within the wall of the periphery and having the cross-section whose area is less than that of the polyhedral cross-section, wall that transmits torque and defines the section of the periphery wall extending in the plane from the nearest end off the polyhedral central section toward the far end, first outer wall which defines the other section of the periphery wall and has the nearest end that is connected with the far end of the wall which transmits the torque at an angle, and far end.
EFFECT: improved serviceability.
8 cl, 40 dwg
FIELD: devices for fastening or securing constructional elements or machine parts together, particularly specially-shaped heads of bolts or screws for rotations by a tool.
SUBSTANCE: screwing device has screw and tool for screw driving. Screw is provided with head having upper surface and groove with the first depression aligned with upper surface and with zone having axial section with substantially straight walls. Tool has engaging part complementary to the first depression. Groove is provided with the second depression formed in bottom of the first depression and having diameter lesser than that of the first depression. Tool is provided with central part shaped so that central part is complementary to the second depression. The first depression has section transversal to screw axis, which is shaped as six-pointed star formed in accordance with Torx® standard (i.e. ISO 10664). The second depression and the central tool part are of round shape. Screw has transition surface extending at the first angle from the first depression to the second one. Tool has mating surface extending at the second angle from engaging part to central part, wherein the first angle is greater than the second one so that a space is created between transition surface and mating surface when tool is inserted in the groove. The space widens towards central tool part.
EFFECT: improved engagement between screw groove and tool, as well as simplified tool structure and elimination of tool production cost increase.
3 cl, 3 dwg
FIELD: mechanical engineering.
SUBSTANCE: invention relates to design of heads of fasteners and it can used at assembling of threaded joints. Proposed threaded fastener with shaped head has head with hollow shaped seat with inner engagement elements in form of alternating curvilinear projections and cavities. Hollow shaped seat of head is provided at inlet with combination entry part consisting of cylindrical belt and conical face after cylindrical belt made at angle of β=120÷150°. Sections of side surface of projections and cavities have conical and cylindrical sections. Conical section has angle α=1.5÷3°.
EFFECT: increased torque transmitted by tool, improved accuracy of alignment and setting of tool in head of fastener.
FIELD: mechanical engineering.
SUBSTANCE: proposed screw contains head with spline space and rod with threaded surface. Conical recess in lower part of spline space exceeds height of spline space and corresponds to conical shank of device for holding and turning-in screws providing holding of screw owing to friction forces. Rod is provided with threaded transient section found between head and threaded surface for rod, and thread of transient section in inner diameter is made with taper corresponding to taper of conical recess. Device for holding and turning-in of screws has housing with turning-in end-piece whose shape corresponds to shape of spline space in screw head. Housing in provided with cup and rod separated by spring and arranged inside housing. Rod is installed for longitudinal travel and angular deflection. Rod is provided with hemisphere in middle part pressed by spring to semispherical bottom of housing inner space. Upper part of rod is pointed and is arranged with possibility of alignment with face of cup for alignment of rod with screw. Lower part of rod is provided with conical shank corresponding to conical recess of screw.
EFFECT: improved reliability of orientation and automatic assembling of screws owing to improved reliability of process of mating.
3 cl, 6 dwg
FIELD: mechanical engineering; fasteners.
SUBSTANCE: proposed fastener has head and cylindrical body. Spline is made in head in form of continuous slot consisting of two straight-line side sections and middle part made symmetrical relative to vertical axis of fastener lying on one straight line with side straight-line sections. Depth of side sections of spline is equal to one third of head height, and depth of middle part of spline is 0.8 Hh where Hh is height of fastener head.
EFFECT: improved reliability of centering of tool at turning in and out of fasteners.
FIELD: mechanical engineering; fasteners.
SUBSTANCE: proposed countersunk screw has threaded body and countersunk head with conical surface tapering towards threaded body with countersink angle α. Conical surface has several ribs spaced over perimeter and defining conical enveloping surface with taper angle β. Countersink angle α of conical surface is less than rib taper angle β. Ribs have outer contact surfaces defining conical enveloping surface. When screw is used for fastening cover plates or other like parts by turning into countersunk hole, surface clamping appears between ribs and corresponding counter sunk holes which prevents damage to surface. Ribs feature cutting effect to form countersinking in soft material when screw is directly screwed into soft material, such as wood. Proposed screw is good for turning into hard material, such as metal, and soft material, such as wood.
EFFECT: improved service properties.
14 cl, 4 dwg
FIELD: machine building.
SUBSTANCE: invention relates to machine building. The proposed fastener represents a screw rod jointed to the head. The said head represents a body of revolution and has two elements for wrench, each being formed by intersection of the body of revolution with two cross-planes. One of the said cross-planes is parallel to the rod axis, while the other one is perpendicular to the first cross-plane. The second cross-planes of each aforesaid element for wrench are arranged in symmetry with respect to the rod axis and intersect at the angle varying from 90 to 140°. The wrench to screw up the said fastener is furnished with a head jointed to the handle. The said head represents a plate with thickness not exceeding the distance between the first cross-planes. The plate free end is furnished with an angular slot with the angle equal to that of intersection of the second cross-planes.
EFFECT: prevention of out unauthorised screwing out.
2 cl, 5 dwg
FIELD: machine building.
SUBSTANCE: fastening element contains head and cylindrical body. In head first groove is made in form of continuous slot consisting of two rectilinear lateral sections and middle part which is made symmetrical relative to vertical axis of fastening element, lying on one line with lateral rectilinear sections. Depth of lateral sections of first groove equals one third of head height. According to first version: depth of middle part of first groove constitutes 0.8 Hh, where Hh - height of fastening element head, to first groove, perpendicular on symmetry axis additional groove is made - slot with depth twice as deep as depth of lateral sections of first groove, with length equal to fastening element head. According to second version, middle part of first groove is made symmetrical relative to fastening element vertical axis in form of semicircle with salience downwards, to first groove perpendicular on symmetry axis additional groove is made - slot with depth twice as deep as depth of lateral sections of first groove, with length equal to fastening element head. According to third version: depth of middle part of first groove constitutes 0.8 Hh, to first groove perpendicular on symmetry axis additional groove is made - slot made similar to first one in form and perpendicular to it. According to fourth version: depth of middle part of first groove constitutes 0.8 Hh, to first groove perpendicular on symmetry axis additional groove is made - slot made only in middle part of head perpendicular to first one and representing semicircle with salience downwards.
EFFECT: increasing reliability of instrument fastening in fastening element head.
4 cl, 9 dwg