Abstract: A fan blade set (10) for a cooling fan includes a hub (12) having a first wall and a second wall extending from the first wall. First blades (14) extend radially from the second wall. Second blades (16) formed on the first wall extend from a central portion of the first wall to a border thereof. Each second blade has a twisted shape such that an angle formed between the surface of the second blade and the first wall varies continuously along the extending direction of the second blade.

Abstract: A sealing apparatus for a fan includes a bearing support (20) and a sealing cover (10). The bearing support includes a base plate (22) with a tube (24) extending from a first side of the base plate. The tube receives a bearing and oil therein. A rotor rotatably engages with the bearing. The base plate defines a circular recess (224) in an opposite second side thereof communicating with an inner hole (242) of the tube, and mounting slots (222) each has a wide portion (222a) and a narrow portion (222b). The sealing cover includes a circular main plate (12) rotatably received in the recess of the bearing support, and latches (16) formed on the main plate and received in the mounting slots respectively. The latches are drivable to move between the narrow portions where the base plate clasps the latches and the wide portions where the base plate releases the latches.

Abstract: A heat dissipation device assembly comprises a heat sink having a columniform conductive core and a plurality of fins arranged radially around the conductive core, a columnar fan cover housing the heat sink and defining a first open end and a second open end, and a fan located at the second open end of the fan cover. Pluralities of channels are formed between the radiation fins. A plurality of elongated slot surrounding the heat sink is defined in the fan cover and extends from the first open end of the fan cover to the second open end. The airflow provided by the fan travels through the channels and the slots to outside of the fan cover.

Abstract: A fan guard includes a frame, a bracket connected with the frame and a bearing seat connected with the bracket. A detachable interlocking device is formed between at least one of the combinations of the frame and the bracket, and of the bracket and the bearing seat.

Abstract: A fan includes a stator including a stator coil assembly (5) having a plurality of coils, and a circuit board (6) having a circuit to control the electrical current flowing through the coils, and a rotor including a hub (31) carrying a permanent magnet (33) facing to the stator coil assembly. At least two sides of the circuit board are substantially straight so that a plurality of such printed circuit boards can be compactly laid out side by side on a substrate (600) for producing the printed circuit boards.

Abstract: A heat dissipation assembly includes a fan frame (11), a blade set (12) rotably mounted in the fan frame, a support member (30) abutting the fan frame, and a number of fasteners (20) mounting the fan frame on the support member. The fan frame defines an inner cavity receiving the blade set, a number of circular through apertures (18) for insertion of the fasteners respectively, and a number of slits (19) communicating with the through apertures to allow the through apertures to be resiliently expandable. For making the fan frame, a female mold (50) includes a number of posts (56) extending therefrom, and a connecting plate (58) connected between a main part of the female mold and each post.

Abstract: A bearing assembly includes a stationary member and rotary member (2) arranged pivotable relative to the stationary member, and a lubricating oil storage (3) attached to the rotary member. The rotary member is spaced from the stationary member with a distance to define a space (5) therebetween. The lubricating oil storage is made of wicking material and received in the space in a manner that the lubricating oil storage does not contact the stationary member. During operation, the lubricating oil storage is rotated with the rotary member, and the lubricating oil of the lubricating oil storage is drawn out and sprayed onto contact areas of the rotary member and the stationary member by a centrifugal force.

Abstract: A bearing assembly includes a sleeve bearing (2) having a mating portion (22) and a center bore (20), a shaft (1) disposed in the center bore, and a rotary block (3) mounted on the shaft and being rotatable therewith. A gap exists between the inner circumferential surface of the bearing and the outer circumferential surface of the shaft to allow the shaft to be capable of rotate in the bore without scrapping the bearing. The rotary block includes a mounting portion (30) engaging with the mating portion of the bearing, whereby the rotary block is rotatably supported on the bearing.

Abstract: A fan frame (10) for encircling an impeller (20) of a fan unit is disclosed. The fan frame includes a base (11) and a plurality of sidewalls (12) extending from the base. The base defines a hole (13) in a center so that an airflow passage is formed between the impeller and the sidewalls. The sidewalls extend upwardly from side edges of the base for encircling the impeller. Each of the sidewalls is bent inwardly to form a bent portion (121) with a groove (14) formed between the bent portion and an adjacent sidewall for providing extra access to airflow through the passage.

Abstract: A fan motor includes a printed circuit board (200), an IC (100) and an insulating frame (50) mounted on the printed circuit board. The insulating frame includes an annular main body (44) with a number of arms (11) extending radially from an outer-periphery thereof, and a retaining member (14) formed thereon corresponding to the IC. The retaining member includes a pressing portion (12) pressing the IC to prevent slant thereof.

Abstract: A bearing assembly includes a tube (30) axially defining an inner hole (32), a radial bearing (10) fixed in the inner hole of the tube and having an inner bearing surface concentric with the inner hole, and a shaft (20) pivotably received the inner hole. The shaft comprises a contact portion (22, 220) circumferentially formed at an outer periphery thereof confronting with the inner bearing surface of the bearing. The contact portion comprises an outer bearing surface being configured to have a substantially same abrasive resistance with the bearing surface to reduce wear thereon.

Abstract: A joint for an articulated ladder comprises two outer casing parts, two inner casing parts, an arched lock piece, and an extension spring. The inner casing parts pivotally engages with the outer casing parts and the arched lock piece is located in the inner casing parts. The spring has one hook end thereof engaging with the locating tab of one of the inner casing parts. The arched lock piece is an integral piece providing with two parallel arched parts spacing apart from each other. Each of the parallel arched parts further provides three short posts extending outward from a facial side thereof to be slidably received in the three arched openings on the inner casing parts respectively. A hook tongue extends outward from one of the flat connecting parts to engage with the other hook end of the spring.

Abstract: A joint for an articulated ladder comprises two outer casing parts, two inner casing parts, an arched lock piece, and an extension spring. The inner casing parts pivotally engages with the outer casing parts and the arched lock piece is located in the inner casing parts. The spring has one hook end thereof engaging with the locating tab of one of the inner casing parts. The arched lock piece is an integral piece providing with two parallel arched parts spacing apart from each other. Each of the parallel arched parts further provides three short posts extending outward from a facial side thereof to be slidably received in the three arched openings on the inner casing parts respectively. A hook tongue extends outward from one of the flat connecting parts to engage with the other hook end of the spring.

Abstract: A ladder with anti-deformed side rails comprises two tubular side rails, a plurality of rungs, and two tubular inner bushings. Each of the bushings is tightly fitted with the inner surface of each side rail respectively and passed through by the respective end of the lowest rung. Additionally, the longitudinal length of the bushings ranging from 2/5 to 3/5 of the distance between two neighbor rungs, and the thickness of the bushings ranging from 4/5 to 1 of the thickness of the side rails lead to an optimum bending strength for the side rails.

Abstract: A pulling device for a foldable ladder joint, comprising: two inner bodies, having facing front surfaces, with aligned sets of three arc-shaped holes each along a circular path; an arc-shaped piece, inserted between the front surfaces of the two inner bodies, extended along the circular path and glidingly movable along the circular path, guided by pins or projections, which extend into the arc-shaped holes of the inner bodies; and a spring with two ends, which are held on a fixed position on one of the inner bodies and one end of the arc-shaped piece, so as to exert an elastic force on the arc-shaped piece along the circular path.