摘要:
A stud used to support a circuit board on a case, the case has a tapped hole, and the circuit board has a locating hole. The stud includes a main body. The main body includes a screw thread portion and a carrying surface, wherein the main body is fixed to the tapped hole of the case by the screw thread portion, and the carrying surface withstands the circuit board, the carrying surface has an opening and a tooling groove, the opening is corresponding to the locating hole of the circuit board. A hand tool is inserting into the tooling groove of main body, and the shape of the hand tool corresponds to the shape of the tooling groove, so that the main body is able to be fixed to the case or detached from the case by the hand tool.
摘要:
A torque-limited fastener turnable in fastening and loosening directions for one-time use includes a fastener head with a base, a set of lugs extending from the base, and an optional set of ramps extending from the base. The lugs include abutment surfaces facing a fastening tool slot recess that receives a fastening tool. When the fastening tool is turned in the fastening direction it bears against the lug surfaces. The lugs shear off or plastically deform into recesses when the fastening tool applies a limiting fastening torque. The ramps have abutment surfaces facing a loosening tool slot recess that receives a loosening tool. The ramps cam the fastening tool over the ramp abutment surfaces if the fastening tool is in the fastening tool recess and is turned in the fastening direction after the lugs have sheared off or have plastically deformed in response to application of the limiting torque.
摘要:
A screw head and screwdriver for use in combination are provided to reduce the occurrence of stripping a screw head during tightening or removing the screw. The head slot employs slot walls that indent in some portion of the wall, the indent portion forming a ledge under which the screwdriver tip may be retentively captured thereby preventing the tip from lifting from the screw slot and stripping the screw head. The screw slot and driver also generally employ a tapered form, such that the slot widens from a central portion out to the outer circumferential edges. The narrow portion of the slot matching in form a narrow portion of the driver tip such that the driver tip tends not to slide off the screw head during use. Utilizing these inventive design concepts prevents the screwdriver tip from slipping off the head and resulting in the need to apply less downward pressure.
摘要:
A combination fastener driver and fastener, the fastener driver including a generally hourglass-shaped tip which flares from the shank to the tip and the fastener includes a generally hourglass-shaped slot in the fastener head with under cut side walls. The flared walls of the driver tip engage the undercut side walls of the fastener slot to lock the tip in the slot when driving the fastener. A waist portion in the driver tip engages a waist portion in the fastener slot to prevent the tip from laterally slipping out of the slot during use.
摘要:
A screw has a head releasably engaged by a flat blade tip in such a manner so as to prevent the flat blade tip from sliding off of the head of the screw as the flat blade up tip drives the screw. The head of the screw has a blind slot defined by a pair of walls and which extends diametrically and completely thereacross, and a blind bore extending concentrically therein. The diameter of the blind bore is less than the width of the blind slot preventing damage to, or breakage of, a drill bit used to drill the blind bore during manufacture by preventing the drill bit from hitting the pair of walls during drilling. The flat blade tip has a projection depending centrally therefrom that is coplanar with, and is a continuation of, the flat blade tip so as to allow the projection to be readily formed by merely removing material from the flat blade tip.
摘要:
A screw has a head portion and a threaded portion. The head portion has an undercut slot extending across it. The slot has a flat floor and sloping sides and the width of the floor of the slot is greater than the width at the top opening of the slot. A matching bit has a shank portion and a flat portion. The flat portion of the bit is not as wide as the top opening of the slot. The flat portion has a foot extending from each end. Each foot has a flat base and inwardly-sloping sides
摘要:
A combination sidewalk bolt is provided. The bolt includes a head portion, a threaded shaft portion extending perpendicularly outward from a first side of the head portion, a socket head recess well formed within a second side of the head portion for use in driving the bolt, and a slotted screwdriver slot provided in the second side of the head portion. A depth of the recess well is greater than the width of the head portion between the first side and the second side.
摘要:
A safety device provides quick and easy removal or separation of a part or assembly from a machine or installation base. The safety release fasteners that secure the part or assembly to the machine or installation base have interconnected sections that are releasable by simply tugging on the part or assembly to allow the sections to snap apart. The breaking of the fastener releases the part or assembly from the machine or installation base, thereby freeing from imminent danger the person, whose hair, clothing or limb may be caught. Axial separation of the fasteners prevent injury to a person or damage to a machine or installation base or to a part or assembly, such as when a large inanimate object is drawn into an intake of a machine or installation.
摘要:
A combination sidewalk bolt is provided. The bolt includes a head portion, a threaded shaft portion extending perpendicularly outward from a first side of the head portion, a Phillips head recess well formed within a second side of the head portion for use in driving the bolt, and a slotted screwdriver slot provided in the second side of the head portion. A depth of the recess well is greater than the width of the head portion between the first side and the second side.
摘要:
The present invention relates to a burred fastener for forming a friction fit between the fastener and a driver. The friction fit retains the fastener in contact with the driver during insertion, tightening and loosening of the fastener into a work surface. Burrs are formed in the inner side surfaces of an indentation or slot formed in the fastener head. A method for forming the burred fasteners includes striking the screw head with a deformation object.