The technology described herein relates to a stackable chalk dispensing device that allows a user to stack multiple chalk dispensing devices to form a vertical or horizontal stack of chalk dispensing devices. The vertical stack of stackable chalk dispensing devices increases the reach of the chalk dispensing device, for example, allowing a user to use the chalk within the chalk dispensing device closest to a receiving surface that the user wishes to mark with the chalk dispensing device. The horizontal stack allows a user to mark with several chalks at once. Thus, the stackable chalk dispensing devices allow for the vertical or horizontal stacking of chalks, which allows users to have flexibility in how the users want to interact with multiple chalks at once, whether it is to reach the floor from a standing position, or making multiple markings with several chalks simultaneously.

The technology described herein relates to a stackable chalk dispensing device that allows a user to stack multiple chalk dispensing devices to form a vertical or horizontal stack of chalk dispensing devices. The vertical stack of stackable chalk dispensing devices increases the reach of the chalk dispensing device, for example, allowing a user to use the chalk within the chalk dispensing device closest to a receiving surface that the user wishes to mark with the chalk dispensing device. The horizontal stack allows a user to mark with several chalks at once. Thus, the stackable chalk dispensing devices allow for the vertical or horizontal stacking of chalks, which allows users to have flexibility in how the users want to interact with multiple chalks at once, whether it is to reach the floor from a standing position, or making multiple markings with several chalks simultaneously.

Conventional whiteboards or chalkboards on which writing is effected using Dry-Erase or chalk markers are enabled for digital conversion of the writing into the digital domain. An indoor positioning subsystem determines the absolute position of a marker with a dry-erase or another conventional writing tip within a local coordinate system to track the location of the marker on the board. Ultra wide band (UWB) is an example technology that may be used for this purpose. An inertial sensor in the marker captures sensor data generated by handwriting by sensing the movement of the marker, essentially tracking the relative positioning and motion of the handwriting. The absolute position and relative positions are then processed to generate digital handwriting which may be refined using deep learning subsystem(s) for handwriting recognition and classification for the data captured by the inertial sensor to determine the most appropriate character or shape of the writing.

An erasable, polymeric paged writing book for small children, with textured, flexible, bordered pages and an internal spine to spread the book flat. The pages have rounded corners. The book closes by hook-and-loop tab. The pages have a smaller profile than the covers, for resistance to wear and distortion. A fold-away pocket holds chalk and grease pencils. Optionally, a pleated storage compartment is on one of the covers. The pages have a smaller profile than the covers, for resistance to wear and distortion.

A pigment application and removal apparatus, variations, and methods of using. The apparatus or device comprises a housing portion with a reservoir compartment and interfaces for pigment application and for pigment removal. The reservoir compartment houses and supplies pigment to the pigment form interface that is applied to a surface. A person swivels the device in one hand to switch to pigment removal at the pigment removal interface.

A device for marking a surface, the device comprising: a body configured to store a marking substance; a guide arrangement having a first end and a second end, at least a portion of an outer surface of the guide arrangement tapering from the first end to the second end which is narrower than the first end, wherein an output path is provided through the second end at substantially the center of the guide arrangement; an activation arrangement; and a delivery arrangement which is configured, in response to triggering of the activation arrangement, to deliver a quantity of the marking substance from the body, along the output path and out of the second end, wherein, in use, a user inserts at least the second end of the guide arrangement into an aperture in an element positioned adjacent a surface until the outer surface of the guide arrangement contacts the aperture, and the user triggers the activation arrangement to deliver a quantity of the marking substance through the second end and onto the surface to mark the surface at a position which is substantially aligned with the center of the aperture.

A device for marking a surface, the device comprising: a body configured to store a marking substance; a guide arrangement having a first end and a second end, at least a portion of an outer surface of the guide arrangement tapering from the first end to the second end which is narrower than the first end, wherein an output path is provided through the second end at substantially the center of the guide arrangement; an activation arrangement; and a delivery arrangement which is configured, in response to triggering of the activation arrangement, to deliver a quantity of the marking substance from the body, along the output path and out of the second end, wherein, in use, a user inserts at least the second end of the guide arrangement into an aperture in an element positioned adjacent a surface until the outer surface of the guide arrangement contacts the aperture, and the user triggers the activation arrangement to deliver a quantity of the marking substance through the second end and onto the surface to mark the surface at a position which is substantially aligned with the center of the aperture.

A chalk stick holder device having a handle portion, a hollow central tube portion, and a gripper portion. The three portions can be joined together to form a long-reaching chalk stick holder for drawing on surfaces while the user remains standing. The gripper portion includes a spring-action receiver for receiving a chalk stick and securing the chalk stick within the gripper end using a locking tooth. Upon pressing the locking tooth, the receiver releases the chalk stick, which can then be replaced with another color of chalk stick stored in the hollow central tube portion.

A chalk stick holder device having a handle portion, a hollow central tube portion, and a gripper portion. The three portions can be joined together to form a long-reaching chalk stick holder for drawing on surfaces while the user remains standing. The gripper portion includes a spring-action receiver for receiving a chalk stick and securing the chalk stick within the gripper end using a locking tooth. Upon pressing the locking tooth, the receiver releases the chalk stick, which can then be replaced with another color of chalk stick stored in the hollow central tube portion.

A side-knock type mechanical pencil comprising a body with a side-mounted knock button coupled to the body of the mechanical pencil and adapted to slidingly engage with a lead tube with a frustoconical hub for translating the motion of the knock button actuation to linear extension of the lead.