摘要:
Elemento de fijación del tipo de los que comprende un primer cuerpo (1 ) donde uno de sus extremos (1 a) es roscado o plano, y donde, en el extremo contrario (1 b) solidariamente unido a él, comprende un segundo cuerpo (2) caracterizado porque dicho segundo cuerpo (2) contiene un rehundido (3) en su parte superior con forma de hendidura plana o de estrella.
摘要:
An improved high torque fastener (10) of the type having a screw head (14) with a generally bow-tie shaped driving slot (16) formed with undercut side walls (24) and an arcuately concave bottom wall (26) for reception of an arcuately convex blade of a driving tool for relatively high torque transfer therebetween. The improved fastener includes a conical recess (18) positioned centrally along the driving slot with a base diameter (28) substantially greater than the width of the slot thereat and an apex (30) disposed substantially below the slot bottom wall. The improved driving tool (12) includes a conical tip (34) formed centrally on an arcuately convex blade (34) with a substantially pointed end (41) projecting beyond the blade, wherein the blade and tip provide geometric surfaces for facilitated and aligned centering and coaxial mating reception into the fastener driving slot and conical recess. Apparatus for forming the improved fastener is also disclosed.
摘要:
In combination, an attachment bolt assembly and a portable manway hinge for assembly to a manway flange and a manway cover where the attachment bolt assembly has an attachment bolt and a removable retaining pin in which the attachment bolt is configured for insertion into a manway flange opening through a corresponding manway cover opening and a corresponding hinge plate opening of the manway hinge in order to retain a hinge plate of the portable manway hinge against the outside back surface of the manway flange with the removable retaining pin transversely disposed through a transverse opening in a distal hinge portion end of the attachment bolt.
摘要:
L'objet de l'invention est une vis comprenant une empreinte (16) ayant des formes adaptées à l'extrémité d'un foret à béton comportant une pastille (26) disposée dans un plan médian longitudinal à son extrémité et de largeur L supérieure au diamètre du corps du foret caractérisée en ce que l'empreinte (16) comprend une partie inférieure (32) adaptée à l'extrémité du foret et une partie supérieure ou débouchante (34) comprenant selon un premier plan longitudinal médian (35.1) une dimension légèrement supérieure à la largeur L de la pastille (26) et selon un autre plan longitudinal médian (35.2) une dimension légèrement inférieure à la largeur L de la pastille (26) et supérieure au diamètre du corps du foret.
摘要:
A fastener (20, 50), particularly for orthopedic use, structurally adapted to be driven into a member somewhat like a nail and to be secured therein by rotating the fastener through a predetermined angular displacement to secure threads on the fastener in the thus-fastened member. The fastener includes a head portion (21, 51) structurally adapted to receive a force axially applied to the fastener, a tip portion (30, 53) structurally adapted for leading the fastener into a member to be fastened, and a shank portion (25, 52) between the head portion and the tip portion, which includes a thread-bearing zone (31, 67) and a thread-free zone (32, 68) circumferentially spaced about the shank portion which together comprise the entire circumference. Preferably, the fastener (20, 50) includes a pair of opposed threadbearing zones (31, 67) spaced intermediate a pair of opposed thread-free zones (32, 68) each occupying 90 of angular displacement about the shank. The angular displacement of a thread-bearing zone may lie in the range of about 120 to 240 .
摘要:
A fastener (200) having a head (202) comprising a recess (206) for receiving the driving portion (12) of a driver (10), the driving portion and the recess being shaped such that rotation of the driving portion within the recess engages the driving portion with the head, such that further rotation of the driver causes the fastener to rotate, wherein the recess in the head of the fastener is tapered in the longitudinal axis of the fastener, such that the recess is widest at its furthest point from the surface of the head of the fastener, and wherein the recess further comprises one or more lateral tapers extending in a direction transverse to the longitudinal axis of the fastener.
摘要:
The screw (10) has a shank (14) and a head (18) with a ring-shaped lower side (19) adjacent to the shank (14) and an upper side (21) opposite thereto. The upper side (21) is interrupted by pairs of diametrically opposed slotted sections (20', 20") that gradually give way to undercuts (26, 28) down below in order to receive sections of the blade (24) of a screwdriver (12) provided with lugs (50, 52). The head (18) has a contact surface (30) for the blade (24) of the screw driver. The undercuts (26, 28) are located substantially underneath the contact surface (30) and are open on the lower side (19) of the head (18) in order to generate high torque and produce the screw at low cost.
摘要:
Figure 1 shows the terminal portion of screwdriver blade having stepped portions of successively smaller dimension towards its tip for use with any of a range of screws with different dimensions where the largest of the screws will have a complementary stepped slot to be engaged by all of the portions (12, 13, 14) of the blade, smaller screws will have a slot to be engaged by the portions (12) and (13) only, and the smallest will have a recess to be engaged by the tip portion (12) only. In other embodiments the portion of the tool may be hexagonal or of other non-circular shape and again the screws are to have complementary recesses. The invention is useful with screws, bolts and other fastening pins both threaded or non-threaded of a wide range of types, and in the case of non-threaded fasteners the tool and recess cross section need not be non-circular.
摘要:
A fastener comprises a threaded shank extending along an axis between top and bottom ends and a semi spherical body affixed at the top end of the threaded shank. The fastener further comprises a head having a receptacle adapted to closely surround the semi-spherical body, the head being pivotable about the semi spherical body and rotatably fixed relative to the semi spherical body about the axis of the threaded shank and a drive disposed on the head adapted to receive a tool for rotating the head and the threaded shank about the axis of the threaded shank.
摘要:
A fastener system including a threaded fastener having a slot formed in the fastener head. Facets are formed in the slot walls, each facet having an angle of less than ninety degrees with respect to the base of the slot such that the slot has a variable width and at least a portion of the width of the base is greater than the width of the opening of the slot. A driver bit includes a blade configured to be inserted into the slot of the fastener. At least a portion of the free end of the blade has an increased width such that the blade is locked within the slot of the fastener when torque is applied to the driver bit.