44results about How to "Avoid space constraints" patented technology

Multiple input multiple output (MIMO) systems are able to provide wireless communications at increased data rates. These systems involve using a plurality of antennas on both the transmitter and receiver and the problem of how to accommodate such structures in user terminals, which are often required to be hand held then arises. An antenna arrangement which is suitable for MIMO communications and which can be incorporated into a user terminal such as a personal digital assistant (PDA) is described. A pair of co-polarised umbrella monopoles and a slot antenna are incorporated into a flap which extends at approximately 90° to the body of the PDA. A fourth monopole is mounted and protrudes from the PDA itself.

The invention discloses a linear guide rail locking device with a protecting function. The linear guide rail locking device is arranged between a moving part and a fixed part of a machine tool. The lateral surface of the moving part, which is opposite to the fixed part, is L-shaped; a guide rail sliding block is arranged on one surface of the moving part; a strip-shaped limiting block or a plurality of limiting blocks are convexly arranged on the other surface of the moving part along the length direction; a linear guide rail is arranged on the lateral surface of the fixed part, which corresponds to the guide rail sliding block; a plurality of through holes are parallelly formed in the lateral surface of the fixed part, which corresponds to the liming block, along the length direction; push rods are respectively arranged in the through holes; a groove is formed at the end of each push rod, which corresponds to the limiting block; a plurality of driving mechanisms are arranged on the outer lateral surfaces of the through holes of the fixed part and are connected with the push rods; and a first protecting block and a second protecting block are relatively arranged on the moving partand the fixed part. According to the linear guide rail locking device disclosed by the invention, a locking oil cylinder is arranged at a position outside the guide rails to avoid the space limit of the traditional arrangement, so that the size and the number of the oil cylinders can be better selected personally and further a larger locking force can be provided; and by arranging the protecting device, the linear guide rail can be better protected by using the large locking force.

The invention discloses a motor and a rotor core thereof. The rotor core comprises a plurality of magnetic pole parts and magnetic steel inserting parts, wherein the plurality of magnetic pole parts are distributed in a circumferential direction of the rotor core; the magnetic steel inserting parts are alternatively arranged with the magnetic pole parts one by one; any two adjacent magnetic pole parts are connected through an outer connecting part close to the outer edge of the rotor core and an inner connecting part close to the center of the rotor core; first bulge parts which protrude to the magnetic steel inserting parts are arranged at the outer connecting parts; the first bulge parts can be propped against outer side surfaces of magnetic steel inserted into the magnetic steel inserting parts; and a first air gap part and a second air gap part are respectively formed in two side parts of each first bulge part. Due to the arrangement, the rotor core of the motor disclosed by the invention is capable of solving the problems that the rotor core is liable to deform when being assembled and a magnetic steel holding space is limited.