A compass, comprising: a housing; a control dial; a drive gear, wherein the drive gear is attached to the control dial; an adjustment gear, wherein the adjustment gear is in in communication with the driver gear; a first gear portion in communication with the driver gear; a second gear portion in communication with the adjustment gear; and a plurality of wheels, wherein the wheels are secured to the first and second gear portions.

A compass, comprising: a housing; a control dial; a drive gear, wherein the drive gear is attached to the control dial; an adjustment gear, wherein the adjustment gear is in in communication with the driver gear; a first gear portion in communication with the driver gear; a second gear portion in communication with the adjustment gear; and a plurality of wheels, wherein the wheels are secured to the first and second gear portions.

A multifunctional writing instrument includes a hollow body, wherein the hollow body comprises one or more cavities configured to attach with a plurality of technical drawing tools. A first writing member having a first writing tip is included. The first writing member includes lead and a mechanical pencil system being provided in a first portion of the hollow body, and wherein the first writing tip is axial with respect to the hollow body. A second writing member having a second writing tip is included. The second writing member comprises ink and an ink pen system being provided in a second portion of the hollow body. The first portion of the hollow body is at an opposite end of the second portion of the hollow body. The second writing tip is axial with respect to the hollow body.

In a cutting device for cutting a round, a transparent substrate is arranged on an object to be cut. A sleeving tube is arranged on the transparent substrate. An end of a transverse rod penetrates through the sleeving rod and extends to over the object. The position of the transverse rod in the sleeving rod is adjusted by a locking member. The other end of the transverse rod is fixed to a cutting assembly. The cutting assembly selectively touches the object. A rotating assembly is combined with the transparent substrate and penetrates through the transparent substrate. When the rotating assembly is pressed to touch the object and the rotating assembly rotates on the object to rotate the transparent substrate, the transverse rod moves the cutting assembly to perform a round-cutting operation on the object or paint a round line on the object.

In a cutting device for cutting a round, a transparent substrate is arranged on an object to be cut. A sleeving tube is arranged on the transparent substrate. An end of a transverse rod penetrates through the sleeving rod and extends to over the object. The position of the transverse rod in the sleeving rod is adjusted by a locking member. The other end of the transverse rod is fixed to a cutting assembly. The cutting assembly selectively touches the object. A rotating assembly is combined with the transparent substrate and penetrates through the transparent substrate. When the rotating assembly is pressed to touch the object and the rotating assembly rotates on the object to rotate the transparent substrate, the transverse rod moves the cutting assembly to perform a round-cutting operation on the object or paint a round line on the object.

A push-action compass is provided which overcomes drawbacks of conventional compasses by retracting its compass legs when not in use. The compass includes a body; a push-type telescopic assembly arranged on the body; first and second housings each connected to the body and configured to open and close relative to one another; and first and second compass legs, each sleeved by the respective housing and rotatably connected to the telescopic assembly. When the telescopic assembly is actuated, it switches between an extended statewhere the tips of the compass legs protrude for useand a retracted statewhere the tips are housed within the housings to prevent accidental injury or damage.

A push-action compass is provided which overcomes drawbacks of conventional compasses by retracting its compass legs when not in use. The compass includes a body; a push-type telescopic assembly arranged on the body; first and second housings each connected to the body and configured to open and close relative to one another; and first and second compass legs, each sleeved by the respective housing and rotatably connected to the telescopic assembly. When the telescopic assembly is actuated, it switches between an extended statewhere the tips of the compass legs protrude for useand a retracted statewhere the tips are housed within the housings to prevent accidental injury or damage.