A transmission device for lifting a sickbed contains a first casing, a second casing, a power input assembly, a power output assembly, and multiple screw elements. The first casing includes a first rotatable connection portion, a second rotatable connection portion, a first space, and multiple locking orifices. The second casing includes a third rotatable connection portion, a fourth rotatable connection portion, a second space, and multiple coupling orifices. The power input assembly includes an input shaft and a first bevel gear. The power output assembly includes an output shaft and a second bevel gear. The multiple screw elements are inserted through the multiple coupling orifices of the second casing to screw with the multiple locking orifices of the first casing.

A transmission device for lifting a sickbed contains a first casing, a second casing, a power input assembly, a power output assembly, and multiple screw elements. The first casing includes a first rotatable connection portion, a second rotatable connection portion, a first space, and multiple locking orifices. The second casing includes a third rotatable connection portion, a fourth rotatable connection portion, a second space, and multiple coupling orifices. The power input assembly includes an input shaft and a first bevel gear. The power output assembly includes an output shaft and a second bevel gear. The multiple screw elements are inserted through the multiple coupling orifices of the second casing to screw with the multiple locking orifices of the first casing.

An improved jack assembly for use with a trailer tongue of a towed vehicle. The jack assembly including telescoping height adjustment of the assembly, a pivot assembly for pivoting between a vertical and horizontal stowed position, and a clip for maintaining a handle assembly in a stowed position when not in use. The jack assembly also includes the use of bushings for the telescoping tubes to enhance the sliding movement between the tubes and aid in maintaining the axial alignment of the tubes thereby extending the life of the jack assembly. The pivot assembly further includes an attachment bracket that may be rotated to accommodate at least two different sizes of trailer tongues.

An improved jack assembly for use with a trailer tongue of a towed vehicle. The jack assembly including telescoping height adjustment of the assembly, a pivot assembly for pivoting between a vertical and horizontal stowed position, and a clip for maintaining a handle assembly in a stowed position when not in use. The jack assembly also includes the use of bushings for the telescoping tubes to enhance the sliding movement between the tubes and aid in maintaining the axial alignment of the tubes thereby extending the life of the jack assembly. The pivot assembly further includes an attachment bracket that may be rotated to accommodate at least two different sizes of trailer tongues.

A manual trailer lifting jack with drill power option includes: an outer tube; an inner tube that is telescopically slidable within the outer tube; a foot that is connected to a bottom of the outer tube; a top block that is connected to a top of the outer tube; a threaded rod that pass through a center of the top block and is rotatably held within the outer tube and fixed from axial movement relative to the outer tube; a threaded block that is connected to a top of the inner tube and has threads that engage the threaded rod so that a rotation of the threaded rod causes the inner tube to slide axially within the outer tube; a driving gear that is connect the top block and drives the threaded rod; a gear shaft that includes a bevel gear and a hexagonal head; and a gear housing that houses the gear shaft, driving gear, and the top block.

A linear jack includes an outer tube, a high speed assembly comprising a first rotating member threadedly coupled to a first translating member, a low speed assembly comprising a second rotating member threadedly coupled to a second translating member, wherein the low speed assembly is coupled to and translates with the first translating member. At least a portion of the high speed assembly is slidable in the outer tube between a first position, wherein the high speed assembly is engaged with a shaft, and a second position, wherein the high speed assembly is disengaged from the shaft. A thread pitch of the high speed assembly is greater than a thread pitch of the low speed assembly.

A tongue jack includes a drive screw and a lifting assembly coupled with the drive screw. A first bevel gear is secured to the drive screw with a rotation axis aligned with a rotation axis of the drive screw. A second bevel gear engages the first bevel gear with a rotation axis perpendicular to the rotation axis of the first bevel gear. A drive head is connected to the second bevel gear, and a coupler is selectively engageable with and disengageable from the drive head. A handle assembly may be connected to the coupler that is rotatable about the rotation axis of the second bevel gear, where the handle assembly includes a crank handle spaced from and parallel to the rotation axis of the second bevel gear.

A tongue jack includes a drive screw and a lifting assembly coupled with the drive screw. A first bevel gear is secured to the drive screw with a rotation axis aligned with a rotation axis of the drive screw. A second bevel gear engages the first bevel gear with a rotation axis perpendicular to the rotation axis of the first bevel gear. A drive head is connected to the second bevel gear, and a coupler is selectively engageable with and disengageable from the drive head. A handle assembly may be connected to the coupler that is rotatable about the rotation axis of the second bevel gear, where the handle assembly includes a crank handle spaced from and parallel to the rotation axis of the second bevel gear.

A jack assembly is shown and describe. The jack assembly may include a first tube having first and second end portions and a central portion between the first and second end portions, and a second tube positioned within the first tube and movable with respect to the first tube. The jack assembly may also include an expanded portion on the first tube, the expanded portion having a larger inner diameter than an inner diameter of the central portion, and a bushing attached to the expanded portion, where the bushing generally prevents contact between the first and second tubes.

A jack assembly is shown and describe. The jack assembly may include a first tube having first and second end portions and a central portion between the first and second end portions, and a second tube positioned within the first tube and movable with respect to the first tube. The jack assembly may also include an expanded portion on the first tube, the expanded portion having a larger inner diameter than an inner diameter of the central portion, and a bushing attached to the expanded portion, where the bushing generally prevents contact between the first and second tubes.