Abstract: A treadmill includes a base assembly, a collapsible treadmill deck and a locking device that includes a telescopic tube and a latch. The telescopic tube supports the treadmill deck in a folded position and includes an inside tube and an outside tube. The outside tube has a pawl hole and a bottom end pivotally mounted to the base assembly. The inside tube is telescopically mounted in the outside tube and has an outside end pivotally mounted on the treadmill deck and multiple positioning holes aligned with the pawl hole. The latch includes a stationary bracket fastened on the outside tube and a pivot pawl pivotally mounted on the stationary bracket. The pivot pawl has an inside end extended into the pawl hole to engage one of positioning holes to interlock the inside tube with the outside tube to firmly hold the folded treadmill deck in position.

Abstract: A locking device to lock a collapsible treadmill deck in a folded position includes a telescopic tube and a lock. The telescopic tube includes an outside tube and an inside tube. The outside tube has a though hole. The inside tube is telescopically mounted in the outside tube and has multiple positioning holes corresponding to the through hole. The lock is attached to the outside tube, aligned with the through hole and includes a mounting bracket, an adjusting knob and a detent assembly. The adjusting knob is rotatably and retractably mounted on the mounting bracket. The detent assembly includes a rotating shaft with a locking pin movably mounted in the mounting bracket and connected to the adjusting knob. Therefore, the locking pin will be pulled into one of the positioning holes to engage the inside tube by pushing the adjusting knob toward the mounting bracket.

Abstract: A substrate has a substrate member, which is made of Cyclic Olefins Polymer (COP) or Cyclic Olefins Copolymer (COC), and two protective layers, which are made of Polymethyl methacrylate (PMMA) or Polycarbonate (PC), provided on opposite side of the substrate member. The COP or COC substrate member has a less water absorption (<0.01%) to prevent the substrate from warping while it is irradiated at single side. The PMMA or PC protective layer has a greater hardness to protect the substrate from damage.

Abstract: A method of fabricating an optical substrate has the steps of: Heat a first material and a second material to their melt conditions. Stack the first material and the second material. Roll a stack of the first material and the second material and mold a surface profile on the second material by means of a roller calender with a figured texture to mold a substrate with a surface thereon. Cool the substrate and cut the substrate.

Abstract: A substrate has a substrate member, which is made of Polymethyl methacrylate (PMMA) or Polycarbonate (PC), having a first side and a second side. On the fist side and the second side of the substrate member provided with an insulating layers respectively, wherein the insulating layers are made of Cyclic Olefins Polymer (COP). The water absorption of COP is less than the water absorption of PMMA and PC to prevent the substrate member from warping while the substrate is heated at a single side.

Abstract: A locking device to lock a collapsible treadmill deck in a folded position includes a telescopic tube and a lock. The telescopic tube includes an outside tube and an inside tube. The outside tube has a though hole. The inside tube is telescopically mounted in the outside tube and has multiple positioning holes corresponding to the through hole. The lock is attached to the outside tube, aligned with the through hole and includes a mounting bracket, an adjusting knob and a detent assembly. The adjusting knob is rotatably and retractably mounted on the mounting bracket. The detent assembly includes a rotating shaft with a locking pin movably mounted in the mounting bracket and connected to the adjusting knob. Therefore, the locking pin will be pulled into one of the positioning holes to engage the inside tube by pushing the adjusting knob toward the mounting bracket.

Abstract: A treadmill includes a base assembly, a collapsible treadmill deck and a locking device that includes a telescopic tube and a latch. The telescopic tube supports the treadmill deck in a folded position and includes an inside tube and an outside tube. The outside tube has a pawl hole and a bottom end pivotally mounted to the base assembly. The inside tube is telescopically mounted in the outside tube and has an outside end pivotally mounted on the treadmill deck and multiple positioning holes aligned with the pawl hole. The latch includes a stationary bracket fastened on the outside tube and a pivot pawl pivotally mounted on the stationary bracket. The pivot pawl has an inside end extended into the pawl hole to engage one of positioning holes to interlock the inside tube with the outside tube to firmly hold the folded treadmill deck in position.

Abstract: A casing has a hollow body, at least one wheel holder and at least one wheel. The body has at least one cavity to respectively receive the at least one wheel holder. Each wheel is rotatably mounted on one of the at least one wheel holder. With the arrangement of the at least one wheel, the casing can be transported conveniently and easily.

Abstract: A control device for a treadmill having a dual-purpose electronic element having a panel and a control circuit formed in the panel. The control circuit basically includes a controller, driving unit connected between the controller and a motor and a speed control and switch unit connected between the controller and the driving unit. The speed control and switch unit has at least two functions which are adjusting the speed of the motor and immediately stopping the rotation of the motor. Therefore the control device not only saves at least one electronic element for the control circuit but the panel has more space.

Abstract: A transportation wheel for a treadmill consists a roller and an engraved pattern defined in an outer surface the roller. The roller has an enlarged middle portion and two tapered ends on which a traveling belt is positioned. The engraved patterns are similar to fabric texture and defined on the outer surface of the roller, especially the enlarged middle portion. The engraved patterns provide an excellent guiding efficiency to keep the traveling belt from detaching from the roller.

Abstract: An angle-adjusting device for a treadmill is composed of two attachment blocks (11) respectively secured at a certain position at two sides of the belt frame of the treadmill and two polygonal feet (20) corresponding to the attachment blocks (11). Each polygonal foot (20) is rotatably attached to the attachment block (11) and directly engages the attachment block (11). Therefore, the belt frame (10) is immovably combined with the polygonal feet (20) to ensure the treadmill has less vibration during operation.

Abstract: A knob having a button for a rheostat includes a base, at least one arcuate contacts, a hub, a pushbutton cap with a conductive arc corresponding to the arcuate contacts and a biasing member mounted in the pushbutton cap. The biasing member can be mounted between the pushbutton cap and the hub or the base to make the pushbutton cap return to its original position when pressure on the pushbutton cap is released. A rotating shaft of a rheostat extends out from the base and connects to the hub. The pushbutton cap is mounted on the hub to turn the hub and the rotating shaft to change resistance of the rheostat.

Abstract: A knob having a button for a rheostat includes a base, at least one arcuate contacts, a hub, a pushbutton cap with a conductive arc corresponding to the arcuate contacts and a biasing member mounted in the pushbutton cap. The biasing member can be mounted between the pushbutton cap and the hub or the base to make the pushbutton cap return to its original position when pressure on the pushbutton cap is released. A rotating shaft of a rheostat extends out from the base and connects to the hub. The pushbutton cap is mounted on the hub to turn the hub and the rotating shaft to change resistance of the rheostat.

Abstract: A control device for a treadmill having a dual-purpose electronic element having a panel and a control circuit formed in the panel. The control circuit basically includes a controller, driving unit connected between the controller and a motor and a speed control and switch unit connected between the controller and the driving unit. The speed control and switch unit has at least two functions which are adjusting the speed of the motor and immediately stopping the rotation of the motor. Therefore the control device not only saves at least one electronic element for the control circuit but the panel has more space.

Abstract: A transportation wheel for a treadmill consists a roller and an engraved pattern defined in an outer surface the roller. The roller has an enlarged middle portion and two tapered ends on which a traveling belt is positioned. The engraved patterns are similar to fabric texture and defined on the outer surface of the roller, especially the enlarged middle portion. The engraved patterns provide an excellent guiding efficiency to keep the traveling belt from detaching from the roller.

Abstract: An angle-adjusting device for a treadmill is composed of two attachment blocks (11) respectively secured at a certain position at two sides of the belt frame of the treadmill and two polygonal feet (20) corresponding to the attachment blocks (11). Each polygonal foot (20) is rotatably attached to the attachment block (11) and directly engages the attachment block (11). Therefore, the belt frame (10) is immovably combined with the polygonal feet (20) to ensure the treadmill has less vibration during operation.

Abstract: An electrical scoring dart target, which provides a "soccer" competition, an "American football" competition, as well as other "sport" competitions effect, is disclosed. The dart target includes a target defining a plurality of target areas. The target areas are divided into a frustration region, an offense/defense interaction region, and an offensive gain region. The electrical scoring dart target further includes a control panel disposed below the target and a control circuit provided within the target. The control panel has two sets of score displays and function keys, as well as a clocking display and a pilot lamp indicating attack. The plurality of target areas are configured as a "soccer", "American football", "basketball" or some other "sports" competition ground.

Abstract: A kind of dart board with a baseball game effect is proposed. The dart board is composed of a plurality of target areas being configured as a baseball field and which are grouped into three main regions of play. A control panel is disposed below the target area and a control circuit provided within the target areas. The control panel has two sets of indicators which show scores, a switch key for switching the competition sides, a selection key for selecting whether one or two players are participating, a set key for setting the innings number, a pilot lamp configured as an infield of the baseball ground for indicating the baserunning and an indicator light composed of a group of lamps for indicating the put-out number. Two sets of flashers are respectively provided on the two sets of indicators for presenting a blinder light to prompt the defense to throw a dart when appropriate.