34results about How to "Guaranteed effective length" patented technology

The invention discloses a folding bicycle, comprising a front wheel, a front fork, a folding handlebar, a frame, a rear wheel, a rear fork, a front chain wheel, a rear chain wheel and a chain, wherein, the frame mainly comprises a crossbeam and a medium tube; a seat tube and the medium tube are in extension-type connection; the rear fork is hinged with the medium tube through a rotary connection structure; the hinged shaft of the rear fork is positioned between the medium tube and the rear wheel parallel to the ground; when the rear wheel is folded inwards along the hinged shaft to achieve a folding state, the seat tube is inserted downwards to the lower part of the seat tube at the position of contacting with the rear wheel; chain dropping resisting structures are respectively arranged on the positions corresponding to the front chain wheel and the rear chain wheel; and the front upper part of the rear fork is against the frame when the folding bicycle is in an unfolding state. The folding bicycle of the invention has smaller bicycle body when being folded, and is convenient for carrying and placing.

The invention provides a main and auxiliary combined medical stretcher, which is composed of a main stretcher and an auxiliary stretcher, the main stretcher and the auxiliary stretcher are connected flexibly, the main stretcher is rectangular, and includes a main stretcher beam, a main stretcher longitudinal beam, a stretcher vertical beam and rollers , the main stretcher beam is arranged horizontally on the main stretcher longitudinal beam, the main stretcher beam and the main stretcher longitudinal beam are connected together to form a stretcher frame, and at least three stretcher vertical beams supporting the entire stretcher frame are arranged on the main stretcher longitudinal beam, The end of the beam contacting the ground is provided with rollers, and on the main stretcher beam at one end of the main stretcher along the longitudinal axis of the main stretcher, there is an extension part that can rotate around the main stretcher beam and expand and contract along the longitudinal axis of the main stretcher, which conforms to the requirements of the elevator car. The change in size ensures that the effective length of the medical stretcher meets the needs of patients of different heights, and achieves the purpose of carrying the medical stretcher in the elevator to achieve emergency rescue. The patient can move with the auxiliary stretcher and transfer to the ambulance to avoid moving the patient. , saving precious rescue time.

The invention provides a foundation pit supporting structure of a drag tube well room and a construction method thereof. The foundation pit support structure includes: two groups of cement mixing pile assemblies provided with several rows of cement mixing piles; wherein, the two groups of cement mixing pile assemblies are respectively arranged along the width direction of the two side walls on which the drag pipe pipes are arranged on the foundation pit , the pulling pipe pipeline passes through the cement mixing pile assembly, and the cement mixing pile assembly is used to form the pile body to solidify the soft sand; between the two groups of cement mixing pile assemblies along the circumference of the foundation pit, except for the position of the pulling pipe pipe, there are several Larsen steel sheet piles, and a closed support structure is formed between the Larsen steel sheet piles and the cement mixing pile assemblies. The invention forms a fully enclosed and stable closed support structure, forms the soil at the two ports of the drag pipe of the foundation pit and forms a stable and closed support structure, makes the foundation pit form a water-blocking closed space, and effectively blocks water , reduce the risk of foundation pit collapse and road subgrade being hollowed out, and avoid the danger of collapse.