Abstract: The present invention relates to a free propeller assembly structure and an aircraft structure has the free propeller assembly. The free propeller assembly structure has at least one free propeller assembly. Each of the at least one free propeller assembly has a circular shaft, a main rotor, a signal transmitting device, and a rotor blade assembly. The main rotor has a shaft hole and multiple blade mounting structures radially disposed. Each blade mounting structure is provided with a positioning recess for mounting a driving motor in each positioning recess. The signal transmitting device includes multiple signal transmitters that are able to transmit interpretable electronic signals or photonic signals. The rotor blade assembly includes at least two rotor blades.

Abstract: An easy-to-hold off-axis pen has a pen head, a barrel, and at least one forefinger support. The pen head is irregularly shaped and hollow. The barrel is connected with the pen head and is hollow to accommodate a cartridge and to be held. A detachable clip fastener is strip-shaped whose two ends are respectively disposed on the pen head and an off-axis part of the barrel. One end of the detachable clip fastener can be pulled by fingers. The at least one forefinger support is disposed on a sidewall of the off-axis part to support and locate the forefinger during writing. The present invention can further include middle finger abutments disposed on the off-axis part and thumb anti-slip parts disposed on the barrel to make the easy-to-hold off-axis pen easy to grasp and anti-slip, and make users comfortable to grasp.

Abstract: A marker pen has a penholder, a bending assembly and a writing part. The bending assembly is mounted on the penholder and includes a bending angle, a first section and a second section. The first section and the second section are connected with each other. The first section is connected to the penholder. The writing part is made of fibers being able to contain ink, is mounted through the bending assembly and is inserted in the penholder. Therefore, it is convenient for a user to hold the marker pen in the hand to meet different situations and the user's line of sight to the writing area is not obscured.

Abstract: A pen with adjustable holding structure is essentially for the user to write with his/her specified finger to lean against a stop protuberance. The pen has a penholder with a writing end formed at its front tip for writing. The stop protuberance is provided ahead of the holding position, and an adjustable holding part is formed on the penholder behind the stop protuberance. With this structure, when manipulating the pen, the user may select one of five fingers as a specified one to lean against the stop protuberance to settle thereat. The adjustable holding part is bendable at random according to the user's manipulation habit so as to lead the specified finger to lean against the best position on the stop protuberance to perform writing with the pen.

Abstract: A pen with adjustable holding structure is essentially for the user to write with his/her specified finger to lean against a stop protuberance. The pen has a penholder with a writing end formed at its front tip for writing. The stop protuberance is provided ahead of the holding position, and an adjustable holding part is formed on the penholder behind the stop protuberance. With this structure, when manipulating the pen, the user may select one of five fingers as a specified one to lean against the stop protuberance to settle thereat. The adjustable holding part is bendable at random according to the user's manipulation habit so as to lead the specified finger to lean against the best position on the stop protuberance to perform writing with the pen.

Abstract: In an offset pen structure for rapid assembling, a holding portion is disposed, and an offset portion extends from the side at the front part of the holding portion, and a writing device base is disposed at the end of the offset portion, wherein the offset portion together with the holding portion has a hollow passage formed therein such that the hollow passage has an opening formed at the front end of the offset portion; the opening being used for mounting a recording device and covered by a lid; the writing device base is disposed at the front end of the lid; a fixing portion is disposed at the rear end of the lid, the fixing portion being fixed at the end of the offset portion to fix and position the writing device base on the holding portion; and further a cap is disposed on the writing device base to form a protection, with a clip disposed on the side thereof, the clip being used to be inserted into a pocket of the user for convenient carry.

Abstract: In an offset pen structure for rapid assembling, a holding portion is disposed, and an offset portion extends from the side at the front part of the holding portion, and a writing device base is disposed at the end of the offset portion, wherein the offset portion together with the holding portion has a hollow passage formed therein such that the hollow passage has an opening formed at the front end of the offset portion; the opening being used for mounting a recording device and covered by a lid; the writing device base is disposed at the front end of the lid; a fixing portion is disposed at the rear end of the lid, the fixing portion being fixed at the end of the offset portion to fix and position the writing device base on the holding portion; and further a cap is disposed on the writing device base to form a protection, with a clip disposed on the side thereof, the clip being used to be inserted into a pocket of the user for convenient carry.

Abstract: A offset pen includes a holding part, a writing end and a connecting part connected therebetween, in which the writing end and the holding part are disposed on different axes. When the user is operating the writing tool, the holding part inclines naturally while the writing end keeps vertical to the writing surface, and the writing result can be observed through the visible space formed between the writing end and the holding part. A holding end is disposed at the front end of the holding part of the writing tool, and each surface of the holding end can be twisted into irregular surfaces. Since the holding part, the connecting part and the writing end are substantially arranged as a Z letter, a perfect fitting feeling of the fingers can be created. Therefore, different users can feel comfortable and the fingers of the users with different holding poses can be naturally directed to a correct holding position, so as to form various geometric states suitable for hand holding.

Abstract: A offset pen includes a holding part, a writing end and a connecting part connected therebetween, in which the writing end and the holding part are disposed on different axes. When the user is operating the writing tool, the holding part inclines naturally while the writing end keeps vertical to the writing surface, and the writing result can be observed through the visible space formed between the writing end and the holding part. A holding end is disposed at the front end of the holding part of the writing tool, and each surface of the holding end can be twisted into irregular surfaces. Since the holding part, the connecting part and the writing end are substantially arranged as a Z letter, a perfect fitting feeling of the fingers can be created. Therefore, different users can feel comfortable and the fingers of the users with different holding poses can be naturally directed to a correct holding position, so as to form various geometric states suitable for hand holding.

Abstract: The present invention relates to an offset pen comprising a holding portion, a writing portion, and an intermediate portion, in which said holding portion is provided for a user to operate by hand, said writing portion is provided with a pen tip for writing, in which a pen tip seat is provided outside the pen tip, and said intermediate portion is used to connect the holding portion and the writing portion so that the writing portion and the holding portion are separately formed on different axes and that a visible space is formed between said writing portion and said holding portion; therefore, when the user operates, the holding portion naturally tilt, while the writing portion keeps vertical to a writing surface for the sake of different axes, so that the user may promptly see the writing result through the visible space; furthermore, a storage chamber is provided in the holding portion, in which pen tips ready for replacement are stored in the storage chamber so that storage and use of the tips may be impl

Abstract: The present invention relates to an offset pen comprising a holding portion, a writing portion, and an intermediate portion, in which said holding portion is provided for a user to operate by hand, said writing portion is provided with a pen tip for writing, in which a pen tip seat is provided outside the pen tip, and said intermediate portion is used to connect the holding portion and the writing portion so that the writing portion and the holding portion are separately formed on different axes and that a visible space is formed between said writing portion and said holding portion; therefore, when the user operates, the holding portion naturally tilt, while the writing portion keeps vertical to a writing surface for the sake of different axes, so that the user may promptly see the writing result through the visible space; furthermore, a storage chamber is provided in the holding portion, in which pen tips ready for replacement are stored in the storage chamber so that storage and use of the tips may be impl

Abstract: An offset pen including a holding portion, a writing portion, and an intermediate portion connected between the holding portion and the writing portion to make the holding portion and the writing portion positioned in different axes is disclosed. The writing portion is separable from the holding portion, for example by dividing the intermediate portion into two engageable parts or by detaching the writing portion from the intermediate portion, in order to facilitate the production of the crooked offset pen and/or the installation of a writing material.

Abstract: An automatic writing apparatus includes a plurality of writing elements axially positioned one by one, each of which has a tip portion at the front end and an element cap having a hole for receiving therein the tip portion of an adjacent one of the writing elements; an outer tube for receiving therein a first and a second ones of the writing elements, wherein the outer tube includes a pen-tip outlet for holding the first one of the writing elements; and an inner tube for receiving therein the others of the writing elements and propelling the second one of the writing elements toward the pen-tip outlet for replacing the first one of the writing elements.

Abstract: The present rolling ruler includes a ruler body having a through hole, a shall having two ends and sleeving thereon the ruler body, and two rollers respectively mounted on the two ends for translating the ruler body. One characteristic of present invention is that different scales are provided on edges of a ruler body.

Abstract: A rolling rule that is effective and/or diversified and/or capable of being easily positioned at a desired position and/or capable of being or easily manipulated/controlled is provided. The rolling rule includes a role body, a roller rotatably mounted in the rule body for enabling the rule body to be translated easily in a parallel fashion, a braking device mounted on one side of the rule body, which is to be exerted by a force generally along a direction parallel to a surface of a work piece for permitting the braking device to easily and conveniently brake the roller when a braking occasion is desired, and an outer surface layer having a relatively high frictional coefficient and surrounding the roller for enabling the roller to be positively controlled in motion or at a stop.

Abstract: A sucker being diversified and/or improved and/or more endurable and/or more effective and/or convenient and/or multi-functional and/or more efficient is provided. The sucker includes a downwardly concave sucking body to be pressed against an attaching surface to vacuumize the room defined therebetween, a downwardly concave resilient member superimprosed above the sucking body and having an outer periphery and a plurality of grooves not beginning from the periphery, and a connector connecting together the sucking body and the resilient member in the manner that after the sucking body has been pressed against the attaching surface, the resilient member will tend to urge the sucking body away from the attaching surface which will in turn result in that the sucking body is more securely attached to the attaching surface.

Abstract: A sucker being diversified and/or improved and/or more endurable and/or more effective and/or convenient and/or multi-functional and/or more efficient is provided. The sucker includes a downwardly concave sucking body to be pressed against an attaching surface to vacuumize the room defined therebetween, a downwardly concave resilient member superimposed above the sucking body and having a periphery and a plurality of grooves, and a connector connecting together the sucking body and the resilient member in the manner that after the sucking body has been pressed against the attaching surface, the resilient member will tend to urge the sucking body away from the attaching surface which will in turn result in that the sucking body is more securely attached to the attaching surface.