A track dolly to mount a camera and accessories thereon is provided. The track dolly includes a steering mechanism to enhance directional control of the dolly when in motion. The track dolly includes a plate, at least one rail coupled to the plate and designed to permit attachment of the camera or accessories thereto, a plurality of wheels rotatably mounted to the plate, a handle rotatably mounted to the plate, and a plurality of linkage members adjustably mounted to the bottom surface of the plate and operably connected to the handle. The linkage members are operably connected to any number of the plurality of wheels. The handle is maneuvered to permit the plurality of linkage members to rotatably adjust any number of the plurality of wheels relative to the plate, thereby adjusting the directional control of the dolly.

A chain tensioner device includes: a threaded bolt (3) for adjusting tension on a chain, that remains inserted in a part (4) integral with the wheel shaft (5), arranged in horizontal position, so that the tip (3a) of the bolt (3), presses on a second part (6) integral at the opposite end of the gear, so that tightening or loosening the bolt (3) determines a gap between both parts (4, 6) to regulate the tension and a discretization mechanism of the gap between the first part (4) and the second part (6) that includes at least a retractable element (8) either in the bolt (3) or in the first part (4) that contacts and is fitted in one of the series of slots (11) provided either in the bolt (3) or in the first part (4) so that it is possible to know the tightening or loosening of the bolt (3) applicable in each action.

This disclosure teaches a device and a system having a gear reduction ratio for use with power tools to mechanically connect to drive shafts of trailer jacks. The device enables the power tools to extend or retract the legs of the trailer jacks in an efficient and easy manner. The device may be installed or retrofitted to existing high capacity trailers or integrated with newly manufactured trailers. In some embodiments, the device has a first interface, a gear train or an equivalent torque magnification mechanism, and a second interface. The first interface enables a power tool or a hand tool to rotationally engage the gear train. The second interface enables the output torque from the gear train to apply to rotate a shaft to raise and/or lower one or more trailer jacks. A power drill can thus couple with the first interface to lift or lower the trailer.

This disclosure teaches a device and a system having a gear reduction ratio for use with power tools to mechanically connect to drive shafts of trailer jacks. The device enables the power tools to extend or retract the legs of the trailer jacks in an efficient and easy manner. The device may be installed or retrofitted to existing high capacity trailers or integrated with newly manufactured trailers. In some embodiments, the device has a first interface, a gear train or an equivalent torque magnification mechanism, and a second interface. The first interface enables a power tool or a hand tool to rotationally engage the gear train. The second interface enables the output torque from the gear train to apply to rotate a shaft to raise and/or lower one or more trailer jacks. A power drill can thus couple with the first interface to lift or lower the trailer.

An articulated chain with alternating inner chain links and outer chain links which are each connected to each other by means of a chain joint, wherein each outer chain link comprises at least two outer link plates and two chain studs connecting them to each other, each inner chain link comprises at least two inner link plates and two joint sleeves connecting them to each other, and for forming a chain joint, one chain stud each of the outer chain link extends through a joint sleeve of the inner chain link. The joint sleeves of the inner chain links are embodied as winding sleeves and firmly connected to the inner link plates, wherein the sleeve joints of the two winding sleeves are positioned on the same side of a link plate's longitudinal axis and face each other, and the sleeve joints are arranged at a distance to the link plate's longitudinal axis and at a distance to an upper apex or to a lower inflection point of the winding sleeve.

An articulated chain with alternating inner chain links and outer chain links which are each connected to each other by means of a chain joint, wherein each outer chain link comprises at least two outer link plates and two chain studs connecting them to each other, each inner chain link comprises at least two inner link plates and two joint sleeves connecting them to each other, and for forming a chain joint, one chain stud each of the outer chain link extends through a joint sleeve of the inner chain link. The joint sleeves of the inner chain links are embodied as winding sleeves and firmly connected to the inner link plates, wherein the sleeve joints of the two winding sleeves are positioned on the same side of a link plate's longitudinal axis and face each other, and the sleeve joints are arranged at a distance to the link plate's longitudinal axis and at a distance to an upper apex or to a lower inflection point of the winding sleeve.

A bed assembly includes a bed having a head end, a foot end and a frame which is connected between the head end and the foot end. A water-proof pad is located between the head end and the foot end. The water-proof pad can be tightened, loosened and movable up and down. A bed board unit is pivotably connected to two sides of the frame so that the bed board unit is opened and closed when needed. An inflatable tub or bedpan is located beneath the bed so that when the bed board unit is opened, the patient can use the inflatable tub or the bedpan and does not have to be removed from the bed.

A bed assembly includes a bed having a head end, a foot end and a frame which is connected between the head end and the foot end. A water-proof pad is located between the head end and the foot end. The water-proof pad can be tightened, loosened and movable up and down. A bed board unit is pivotably connected to two sides of the frame so that the bed board unit is opened and closed when needed. An inflatable tub or bedpan is located beneath the bed so that when the bed board unit is opened, the patient can use the inflatable tub or the bedpan and does not have to be removed from the bed.

A method of fabricating a chain tensioner includes bending a sheet metal blank to form a connector portion perpendicular to a flat base. The connector portion has an arm extending beyond the base. The method further includes stamping an end of the arm to curl the end into a hollow cylinder having an axis perpendicular the flat base. Curling the end into a hollow cylinder may be performed in a series of stamping operations. The blank may define a gap which extends around a narrower portion of the arm after the end is curled into the hollow cylinder.

A method of fabricating a chain tensioner includes bending a sheet metal blank to form a connector portion perpendicular to a flat base. The connector portion has an arm extending beyond the base. The method further includes stamping an end of the arm to curl the end into a hollow cylinder having an axis perpendicular the flat base. Curling the end into a hollow cylinder may be performed in a series of stamping operations. The blank may define a gap which extends around a narrower portion of the arm after the end is curled into the hollow cylinder.