Lifting equipment for lifting a waffle slab used in a construction includes a main body bracket, a sliding member and a plurality of clamping mechanisms for clamping the waffle slab. The main body bracket has a through hole in a center thereof. The sliding member is slidably disposed in the through hole of the main body bracket. The sliding member includes an engagement member located at the top of the sliding member, a shaft portion connected to the bottom of the engagement member and slidably disposed in the through hole of the main body bracket, a sleeve fitted to an outer circumference of the shaft portion, and a flange fixed to the bottom of the shaft portion for preventing the sleeve from moving downward.

A Building Element Lift Enhancer is described. The Building Element Lift Enhancer provides for the movement and precise placement of building elements such as blocks or sheet products by one worker. The Building Element Lift Enhancer senses the force applied by a user to the building element and converts that user applied force to mechanically assisted force from the Building Element Lift Enhancer, allowing the user to precisely move and handle large, heavy or bulky building elements by direct interaction with the building element.

The virtual presentation technology in this invention can significantly reduce data load on a network and thus reduce the network bandwidth requirement. This allows serving more requests for data transaction over a network with fixed network bandwidth. In addition, with traditional Internet file sharing products, e.g. the then-existed Yahoo Group online service, in order to stop sharing a file, the file must be physically deleted that prevents resharing the file unless expensively recreating them. In addition, traditional email and instant message does not allow a user to delete a previously posted or shared message from a UI of a recipient. Therefore, the user could be embarrassed if the posted message is not proper to the recipient. This invention has overcome the problems to allow user instantly deleting posted information of file or folder from recipient's UI without physically deleting the file, and deleting previously posted messages from recipient's UI.

The virtual presentation technology in this invention can significantly reduce data load on a network and thus reduce the network bandwidth requirement. This allows serving more requests for data transaction over a network with fixed network bandwidth. In addition, with traditional Internet file sharing products, e.g. the then-existed Yahoo Group online service, in order to stop sharing a file, the file must be physically deleted that prevents resharing the file unless expensively recreating them. In addition, traditional email and instant message does not allow a user to delete a previously posted or shared message from a UI of a recipient. Therefore, the user could be embarrassed if the posted message is not proper to the recipient. This invention has overcome the problems to allow user instantly deleting posted information of file or folder from recipient's UI without physically deleting the file, and deleting previously posted messages from recipient's UI.

A disclosed gripping system for lifting planar objects comprises a back plate, center sliding plate, lifting pin assembly and cam plate in pivotal connection. Slabs of granite, concrete, marble and other dense planar objects may be safely lifted, moved and lowered, with automatic locking and unlocking of the planar object occurring in response to either the gripping system being lowered upon the planar object, or the planar object being deposited upon the ground.

A lifting device is disclosed in which tong arms are coupled to parallel laminated horizontal spine members that slide in opposition to each other via input of force from the tong arms. The horizontal spine members are coupled to load-engaging feet to transfer the force of the tong members to a given load. The horizontal spine members include teeth or the like along a horizontal axis for engagement and indexing of the load-engaging feet.

The present application relates to lifting equipment for a waffle slab used in a construction. The lifting equipment comprises a main body bracket, a sliding member and a plurality of clamping mechanisms. The main body bracket has a through hole in a center thereof. The sliding member is slidably disposed in the through hole of the main body bracket and is slidable between a first position and a second position. Each of the plurality of clamping mechanisms comprises a clamping member and a connecting rod. The clamping member comprises a first end and a second end, wherein the first end is pivotally connected to an outer edge of the main body bracket, and the second end is configured to extend into a hole of the waffle slab for clamping the waffle slab. A proximate end of the connecting rod is pivotally connected to a lower end of the sliding member, and a distal end of the connecting rod is pivotally connected to the clamping member between the first end and the second end.

A pipelayer machine is provided. The pipelayer machine has a main body, a boom pivotally connected to a first side of the main body, a hook winch provided on the first side of the main body and a boom winch provided on the second side of the main body. The boom winch and the hook winch can be connected to a structural assembly that positions the boom winch proximate the second side of the main body and positions the hook winch proximate the first side of the main body of the pipelayer machine. The hook winch can be provided in a hook winch frame and the hook winch frame can form a structural member in the structural assembly.

Fast, volume, and secure information exchange is important in enhancing the efficiency of a communication network at Internet era. Video sharing in online meeting is an important part of information exchanging between people in business and in daily personal life. Video sharing between two or more user devices through a server on the Internet usually will consume tremendous network bandwidth and computing power. Therefore, there is needs to enhance the efficiency for the video sharing. With the supporting of posting and un-posting operations and the dynamic workspace technology introduced in this invention, a server here can centrally coordinate the dynamic secure video sharing between two or more devices while avoiding itself being a bottleneck for the video sharing. In addition, there is need for enhancing security for the online meeting. The method of effectively tracking activities for meeting participants during the online meeting disclosed in this invention can enhance the security for the online meeting.

A self-tightening culling clip used to secure a marker to a fish for quick identification of the fish in a livewell, for example. The self-tightening culling clip has handles coupled together about a handle pivot and a marker attached to a lift-pivot. A spring forces the jaw end of the handles together and a user may squeeze the handle end of the handles to open the jaws for attaching to a fish. When the marker is lifted, the handles pivot about the handle-pivot to apply force to close the jaws, thereby creating a self-tightening culling clip. A pair of links extend from the lift pivot to the handles and these links for the handle end of the handles outward when the marker is lifted. The marker may have a distinctive identifier color and/or character.