A drive mechanism for a medication delivery device containing a resilient member and having a rotation member configured to be rotated in a first direction during setting of a dose of a medication and to be rotated in a second direction during delivery of the dose, where the rotation member is coupled to a drive member that is coupled to a piston rod such that on dose delivery the piston rod is displaced in a distal direction to dispense a medicament and where the resilient member prevents movement of the drive member and the piston rod during dose setting.

A ratcheting belt system with opposed rollers and quick release capability provides two opposed rollers which frictionally allow a tightening belt of a safety harness, cargo securement system, between themselves compressively, via a manually operated ratcheting handle such that the excess length of belt distal to the active portion used for securement is passed through the system substantially parallel to the active portion of belt, and need not be contained on a spool. A ratchet mechanism prevents back-out of the belt through the buckle, a manually operated lever provides for opening of the rollers away from each other and easy, quick exit of the driver, passenger, or cargo from securement.

A dual powered propulsion system for use with a human powered vehicle is provided. The system includes a connecting rod with a front end operatively coupled to yoke-connected forearm bars. The system also includes a splitter coupled to a rear end of the connecting rod, wherein the splitter is coupled to a first rack and a second rack that operate with a first and second pinion gear to turn a crank axle. This system supplies rotational power to the crank axle in a single rotational direction as the connecting rod is oscillated up and down and back and forth. Even though a solid connecting rod is used to transfer power from the oscillating forearm bars to the crank axle, the vehicle is steerable to the right or left as a result of the use of a carriage, on rollers, and a turning track operatively connected to the forearm bars.

A hand tool assembly includes a body having a ratchet portion, a room and a window. A driving unit is rotatably received in the ratchet portion and the room of the body. The driving unit includes a driving head, a pawl, a spring and a rotary member. The rotary member is rotated via the window to control the operational directions of the driving unit. A seat is connected to the body, and the driving unit is connected between the body and the seat. The seat includes an insertion portion formed on one end thereof, and which is engaged with the room. The seat has an engaging portion formed on the other end thereof. The seat is replaceable to make the hand tool assembly have more functions.

A spring component for a ratcheting mechanism, such as a ratchet wrench. The spring component is shaped to be retained in a recess without any special machining. For example, the spring component can be retained at three abutment points. A leaf of the spring component can abut a pawl, and a base portion opposite the leaf can abut the drive gear. Support arms can abut the sidewall of the recess to retain the spring component within the recess without the need for special machining or tooling.

In one aspect, a system for adjusting the conveyor belt tension force within an agricultural harvester may include a conveyor having a first roller, a second roller spaced apart from the first roller, and a conveyor belt configured to engage the first and second rollers. The system may also include a tensioner assembly having a ratcheting mechanism configured to selectively adjust a position of the first roller relative to the second roller to adjust a tension force exerted on the conveyor belt.

A track start wedge includes a housing, a ratchet gear assembly, and a locking pawl assembly. The ratchet gear assembly is disposed at least partially within the housing and includes a bar, a pinion gear at each end of the bar, and a ratchet gear between the ends of the bar. The locking pawl assembly is coupled to the housing and includes a locking pawl disengageably coupled to the ratchet gear and a spring operable to bias the locking pawl into engagement with the ratchet gear. The ratchet gear assembly is configured to rotate in unison in a first direction toward a front of the housing and a second direction toward a rear of the housing, but the locking pawl prevents rotation of the ratchet gear in the second direction when the locking pawl is engaged with the ratchet gear.

A ratchet wheel includes an outer surface multiple ratchet teeth formed thereon, an inner surface having a polygonal hole defined therein, a first end and a second end. An electro-plating process is applied to the ratchet wheel to form a protective layer plated on the whole ratchet wheel. The protective layer is a durable and high stiffness metal layer or an alloy layer. An isolation layer is coated to the outer surface of the ratchet wheel, and a recognition layer is formed on the protective layer on the inner surface, the first end and the second end of the ratchet wheel.

A ratchet wheel includes an outer surface multiple ratchet teeth formed thereon, an inner surface having a polygonal hole defined therein, a first end and a second end. An electro-plating process is applied to the ratchet wheel to form a protective layer plated on the whole ratchet wheel. The protective layer is a durable and high stiffness metal layer or an alloy layer. An isolation layer is coated to the outer surface of the ratchet wheel, and a recognition layer is formed on the protective layer on the inner surface, the first end and the second end of the ratchet wheel.

A reciprocating action drive having an elastically extensible reversing mechanism is disclosed in which drive levers are connected to a driven shaft by overrunning clutches such that when the levers are moved in a first direction, the shaft is driven, but when moved in a counter-rotating direction, it is not. The extensible reversing mechanism links the levers such that, when not extended, it causes the two levers to counter-rotate, only allowing one to drive the shaft. However, when the lever being moved in the non-driving direction changes direction, the reversing mechanism extends and does not immediately cause the other lever to change direction, but allows it to continue to move in the driving direction. Both levers may, therefore, simultaneously drive the driven shaft for as long as the extensible reversing mechanism extends, allowing latitude for unsynchronized reciprocating motions to be applied without them competing against each other.