Abstract:
Various embodiments described herein provide a fastener system having straight walled driving surfaces that provides a reliable stick fit feature, while also improving stability of engagement between the system components. A feature of the new system is to allow engagement of existing standard straight walled drivers in the new system.
Abstract:
A screwdriver having a retention mechanism for temporarily holding a screw in place on it tip while the screw is being positioned, rotated or removed. More particularly, a screwdriver with a cruciform head used in the installation and removal of bone screws during maxillofacial surgery.
Abstract:
A fastener comprising a thin driving head (40) and a threaded shank (50), wherein head (40) includes recess (25) having a top portion (11) and a bottom portion (12) for receiving the tip of a driver. Recess (25) further comprises an abutment or step (10) extending from bottom portion (12) of recess (25) with abutment (10) running along the periphery of recess (25). Preferably recess (25) has tapering walls and is triangular in configuration with an abutment (10) located in at each corner. The fastener may be a miniature screw for use in electrical or electronic appliances such as computers and mobile phones.
Abstract:
The present invention relates to a screw system comprising a curved slot on the head thereof and a screwdriver comprising a tip of a respective profile, where the screw (1) of the system comprises a head (2) with a slot (3) configured in a curved X shape, in a way that no angle is formed along the length of the slot (3), and the invented screwdriver (4) of the system comprises a tip (5) the profile of which has an appropriate respective curved configuration in order to exclusively fit the slot (3) of the head (2) of the screw (1) of the system. At the screw or unscrew of the screw (1) by the screwdriver (4), pressure is not exerted on a specific part of the slot (3) of the screw (1), but evenly on all parts of the curved slot (3) and therefore, no distortions are created along the length of the slot (3) of the head (2) of the screw (1) and there is no danger for the tip (5) of the screwdriver (4) to be broken or distorted regardless of the amount of pressure exerted.
Abstract:
A screw driver bit (12) and mating screw socket (18) have mating curved side walls (26, 20). The socket includes inner side walls (20) facing inward and the bit includes outer side walls (26) facing outward. The socket and the bit may both be polygonal in cross section, or alternatively, the socket may comprise a plurality of radially extending slots defining the inner side walls at respective free ends thereof while the bit comprises mating ribs defining the outer side walls at the free ends of the ribs. When the side walls of the socket are concave and the side walls of the bit are convex, a single driver bit configuration can mate with many sizes of sockets, including existing Robertson or Phillips designs. Similarly, various sizes of conventional Robertson or Phillips driver bits can be mated with a given socket size according to the present invention.
Abstract:
A screw (10) has a threaded shank (12) and a head (14). The head has a recess (18) that comprises three lobes (18a, b, c). Each lobe is separated by a curved drive flange (20a, b, c). A driver (100) has a drive tip (114) that fits the recess of the screw.
Abstract:
System comprising a screw and a tool (6) therefor, in which the screw has a screw head (1) with a slot (2), the slot (2) having a first recess (3) with an approximately straight-walled cross section, and the tool being provided with an engagement section (16) that is complementary to the first recess (3). The slot has a second recess (11) at the bottom of the first recess (3), with a smaller diameter than that of the first recess (3), and the tool (6) is provided with a central point (17) that complements the second recess (11). The second recess (11) has a circular cross section and the central point (17) of the tool (6) has a circular cross section.
Abstract:
A high torque wrenching system is provided having a wrench with asymmetrical torque transmission capability. The wrench includes a plurality of protuberances and a plurality of recesses around a central axis. The fastener also includes a plurality of protuberances and recesses around the central axis for mating with the wrench. The protuberances and recesses form a saw tooth shape. Each tooth or protuberance is formed by a first wrenching surface for loosening the fastener and a second wrenching surface for tightening the fastener. The wrenching surface carrying the loosening load will be at a much smaller angle, with respect to a radial vector extending form the wrench's central axis, than the wrenching surface carrying the tightening load. The result is that the loosening torque vector will have a much greater moment arm.