Abstract:
A fastener includes a round, blind hole or pocket in its head. Installation and removal of the fastener is accomplished with a tool containing an eccentric segment on the end of a shaft. When rotated within the pocket, the eccentric segment displaces laterally relative to the shaft to provide a friction grip to the lateral wall of the pocket. The strength of the grip is proportional to the applied torque. Eccentric displacement allows rotation but prevents the tool from spinning out of the fastener thereby eliminating cam-out and surface damage resulting from contact with a spinning tool tip. The eccentric head of the tool can be made disposable and to shear off when a predetermined torque is reached. The smooth-sided round hole offers no purchase for commonly available tools; making the fastener tamper-resistance. In another embodiment, the fastener includes a raised portion in the pocket. A tool having a complementary opening shears off the raised portion at a predetermined torque.
Abstract:
Various screws (420, 720, 1020) and corresponding screwdrivers (404, 704, 1004) are disclosed. In one embodiment a screw (420, 720) has a single, circular, non-axial bore (424, 724) is disclosed. In another embodiment a screw has plural bores or other shaped bores (1024).
Abstract:
Various screws and corresponding screwdrivers are disclosed. For example, in one embodiment a screwdriver having a single, circular, non-axial pin is disclosed, and a corresponding screw having a single, circular, non-axial bore is disclosed. In another embodiment, a screwdriver (and corresponding screw) having a plurality of pins arranged asymmetrically about the central axis of the screwdriver is disclosed. In yet another embodiment, a screwdriver (and corresponding screw) having an irregularly-shaped and centrally-located pin is disclosed. Techniques for combining these and other features in. various ways are also disclosed.
Abstract:
Aself locking fastener (30) including a blind bore (12) sized to recieve a male threaded component, the male threaded component engaging or forming a complementary thread on at least part of inner surface of the blind bore (12), at least one first part of the bore (12) being an interference fit with the thread of the male threaded component.
Abstract:
A device for locking bicycle components to the bicycle frame (20) comprises a threaded bolt (12) with a corresponding nut (28) having a rotatable casing (34) surrounding the outer surface thereof and a key (40) for engaging the nut (10). The key and the end face (30) of the nut have at least one spigot (44, 38) and at least one hole (46, 36) such that the spigots of each fit into the holes of the other. When so engaged, the key is capable of turning the nut. The key preferably includes leverage arms (52, 102, 104) for aiding the turning of the nut. The key can also be used on correspondingly configured locks.
Abstract:
The invention relates to a rock bolt (1) and method of installing a rock bolt, particularly a hollow bolt. The method of installation utilises a chemical anchor, the components of which are provided in a cartridge (4) which is either injected through the bolt or removably attached to an end thereof. The bolt preferably includes a thread (40) formed by plastically deforming the walls (41) of the bolt so as to maximise tensile strength whilst minimising wall thickness.
Abstract:
A fastener (10) including a core bolt (12) and a sleeve (14) adapted to receive the core bolt (12). The sleeve (14) includes an elongated portion (15) and a head (16) including a first, outer surface and a plurality of embossments located on and extending from the first surface (18). The plurality of embossments is adapted to mate with and be engaged by corresponding debossments of a fastener installation tool. The embossments react installation torque.
Abstract:
The invention provides a screw in which the screw head (1) has a slot (2) in the upper surface of the screw head, an upper peripheral wall (9) of regular planform extending down from the rim of the slot into the screwhead, the upper peripheral wall (9) being generally aligned with the axis of the screw to form a recess (3), a sloping transition surface (15), extending downwardly and inwardly with respect to the lower edge of the upper peripheral wall (9), and a further recess (11) extending downwardly from the lower edge of the sloping transition surface (15), in which the dimensions of the screw head are such that when the screwhead is engaged by a tool (6) having upper (16) and lower (17) engagement sections, and in which the upper engagement section (16) extends downwardly with respect to the axis of the screw to which the tool is to engage and the lower engagement section (17) extends further downwardly, and in which there is at least one protrusion (or rib) (21) on the inside wall (12) of the further recess (1 1), so that there is a 'stick fit' between the protrusion (21) on the inside wall (12) of the further recess (1 1) and the lower engagement section (17) of the tool (6).
Abstract:
Bei einer Vorrichtung zum Lösen einer Sicherungsschraube (5) für eine Einheit (3) in einem Gehäuse (2), insbesondere einer Ritzeleinheit (1) in einem Lenkgetriebe eines Kraftfahrzeuges, ist die Sicherungsschraube (5) über ein Außengewinde (8) mit einem Innengewinde im Gehäuse (2) verbunden, wobei die Sicherungsschraube (5) mit einer Rasteinrichtung (7) versehen ist, die am Umfang der Sicherungsschraube (5) verteilt angeordneten Rasthebel (9) aufweist, die jeweils mit an den freien Enden der Rasthebel angeordneten Rastnasen (12) versehen sind. Die Rastnasen (12) rasten in Verzahnungslücken (14) einer Verzahnungsgeometrie (13) des Gehäuses (2) ein. Zum Lösen der Rasthebel (9) mit den Rastnasen (12) aus ihrer Raststellung durch eine radial nach innen gerichtete Bewegung der Rasthebel (9) ist die Rasteinrichtung (7) mit einem Werkzeug (16) verbindbar.
Abstract:
This invention relates to a limited torque bolt mechanism comprising, a bolt with threaded shank portion at one end, an optional non-threaded flange adjoining the threaded portion, a non-threaded bolt head at the other end, the top face of bolt head being provided with one substantially coaxial hole for slidably receiving a pivot pin and a non-threaded adaptor having a head with the bottom face being provided with a pivot pin, said pivot pin being substantially coaxial with said head, wherein the bolt head and the adaptor are each provided with shearable means for engaging the bolt head with adaptor to enable rotation of the bolt by corresponding rotation of the adaptor and which means shear and thereby disengage bolt from adaptor when torque on the adaptor reaches a predetermined value. The present invention teaches two non-limiting shearable means. The first means comprises one or more sockets provided on top face of bolt head and corresponding socket on bottom face of the adaptor and one or more pins slidable fit the socket in bolt head and. corresponding socket in adaptor. Another means comprises one or more wedge shaped member fixed on the top face of bolt head and bottom face of adaptor. The wedge shaped member mesh with each other to provide the shearable means.