Abstract: A decontamination apparatus for a viewing window includes a cylinder and a rotating module disposed at one end of the cylinder. The rotating module is connected with a viewing window. The rotating module can be driven to rotate, which further drives the viewing window to rotate for removing dirt attached to the viewing window. Besides, a decontamination apparatus for a viewing window includes a cylinder connected with a viewing window and a rotating module disposed at one end of the cylinder. The rotating module is connected with a wiper in contact with the viewing window. The rotating module can be driven to rotate, which further drives the wiper to turn for removing dirt attached to the viewing window.

Abstract: A decontamination apparatus for a viewing window includes a cylinder and a rotating module disposed at one end of the cylinder. The rotating module is connected with a viewing window. The rotating module can be driven to rotate, which further drives the viewing window to rotate for removing dirt attached to the viewing window. Besides, a decontamination apparatus for a viewing window includes a cylinder connected with a viewing window and a rotating module disposed at one end of the cylinder. The rotating module is connected with a wiper in contact with the viewing window. The rotating module can be driven to rotate, which further drives the wiper to turn for removing dirt attached to the viewing window.

Abstract: A decontamination apparatus for a viewing window includes a cylinder and a rotating module disposed at one end of the cylinder. The rotating module is connected with a viewing window. The rotating module can be driven to rotate, which further drives the viewing window to rotate for removing dirt attached to the viewing window. Besides, a decontamination apparatus for a viewing window includes a cylinder connected with a viewing window and a rotating module disposed at one end of the cylinder. The rotating module is connected with a wiper in contact with the viewing window. The rotating module can be driven to rotate, which further drives the wiper to turn for removing dirt attached to the viewing window.

Abstract: Disclosed is a dental handpiece structure including a head having a turbine chamber, a rotor installed in the turbine chamber and having a transmission shaft, and a transmission element composed of a plurality of turbine vanes. A high-pressure air entering into the turbine chamber can push each turbine vane to drive and rotate the rotor, and a breach is upwardly formed between two adjacent turbine vanes. A head cap is covered onto the turbine chamber, and a circular groove is formed at the head cap and between an end surface facing the turbine chamber and the transmission element, and the circular groove and each breach are arranged opposite to each other for collecting the high-pressure air guided out from each breach to enhance the cutting force of the dental handpiece.

Abstract: Disclosed is a dental handpiece structure including a head having a turbine chamber, a rotor installed in the turbine chamber and having a transmission shaft, and a transmission element composed of a plurality of turbine vanes. A high-pressure air entering into the turbine chamber can push each turbine vane to drive and rotate the rotor, and a breach is upwardly formed between two adjacent turbine vanes. A head cap is covered onto the turbine chamber, and a circular groove is formed at the head cap and between an end surface facing the turbine chamber and the transmission element, and the circular groove and each breach are arranged opposite to each other for collecting the high-pressure air guided out from each breach to enhance the cutting force of the dental hand-piece.

Abstract: A motor spindle fixture includes a fixing base, a motor and a casing. The motor includes a main body and a spindle penetrating through the main body and protruding from both ends of the main body. The spindle has an end defined as a driving end for driving an external device and another end defined as a fixing end. The motor is pivotally mounted onto the fixing base through the driving end of the spindle. The casing is mounted onto the fixing base and has an accommodating space for accommodating the motor, and a chamber concavely formed on a sidewall of the casing and corresponding to the fixing end of the spindle. The chamber includes a fixing element, and the fixing end of the spindle is extended into the chamber and pivotally coupled to the fixing element for fixing the spindle, and preventing the spindle from being damaged by external impact forces during the operation of the motor.

Abstract: A transmission structure improvement for bending a tail pipe includes a main body, having a containing space, and an opening is disposed at the main body, such that the containing space communicates with the exterior of the main body through the opening, and one end of the main body has a first attachment end and the other end has a second attachment end, and the second attachment end bends at a bend angle relative to the first attachment end and a plurality of first connecting portions are disposed at the main body; a side panel, having a plurality of second connecting portions, and the second connecting portions and the first connecting portions correspond to and are engaged with each other, such that the side panel is mounted at the opening.

Abstract: A phase control structure for crank-connecting control disk has a control disk on a helicopter body. The control disk is connected with a crank assembly pivotally connected to the body. The crank assembly includes a connecting element, a first crank and a second crank. The connecting element, the first crank, and the second crank can pivotally rotate with respect to each other. When the control disk is pulled by a first or second pulling rod, the phase thereof can be achieved using the crank assembly. This can increase the precision in the motion of the helicopter.

Abstract: The present invention discloses a rotational speed apparatus that includes a main body, a light-transmitting liquid crystal display installed at the main body and a frequency adjusting button module. The liquid crystal display has an observing area which can be adjusted by a frequency adjusting button module to output a bright screen or a dark screen according to a predetermined frequency, and the light passing through the observing area is blocked periodically, so that a user can observe a rotating object through the observing area. If the rotating track of the measuring rotating object remains still, then a blinking frequency observed through the observing area can be used for measuring the rotational speed of the rotating object.

Abstract: A press-type bit-holding mechanism of a dental high-speed handset, including a hollow rotary shaft, a push button accommodated in the hollow rotary shaft and a holder barrel also accommodated in the hollow rotary shaft. The push button has a first coupling section formed with two opposite splits and two opposite first projecting posts. The first projecting posts and the splits are interlaced with each other. The holder barrel has a second coupling section has two second splits and two second projecting posts complementary to the first splits and the first projecting posts of the first coupling section of the first coupling section of the push button.

Abstract: An improved model helicopter includes a main body and a tail pipe connecting base, and the main body has a containing space for containing a rotor transmission mechanism of a model helicopter and a connecting track transversally disposed on the main body, and the tail pipe connecting base is connected to a tail pipe, and a transmission module is pivotally connected to an end of the pipe connecting base without the tail pipe, and the tail pipe connecting base is detachably installed into the connecting track of the main body.

Abstract: A rocking arm insertion pin fixing mechanism of toy car, including a front bracket, a rear bracket, two insertion pins and four movable seats respectively fitted in the receptacles of the front and rear brackets. The movable seats can be freely revolved within the receptacles to automatically adjust the angle contained between the insertion pins and the front and rear brackets.

Abstract: A boring drill for toy model includes a conic drill bit. A connecting rod extends from one end of the drill bit for connecting with a drive for rotationally driving the drill bit. The drill bit has at least one blade section and marked face. Scales and sizes denoting the scales are marked on the marked face for measuring the diameter of the bore. Each scale corresponds to the diameter of the bore drilled by the drill bit. The size denoting each scale shows the size of the diameter of the bore drilled by the drill bit.

Abstract: A remote controller has a body and a seat. A holding portion is between the body and the seat for being held by a hand of a user. The body is installed with a trigger and a rotary wheel for being held and operated by two hands of the user. The trigger is installed at an intersection of the body and the holding portion. The rotary wheel is installed on the body facing toward a lateral surface of the user. An angle is formed between an axial line of the rotary wheel and a moving direction of the trigger, wherein the angle is larger than 90 degrees.

Abstract: A mold and method for producing a two-stroke engine casing of a radio control model are to define a core cavity and a main cavity in the mold. A first core has a first end inserted into the mold and the core cavity is defined around the first end of the first core for forming a core and simplifying the manufacturing processes. The first core with the core is inserted into the main cavity to from the cylinder of the engine and the blocks of the core define grooves in the inner periphery of the cylinder of the engine.

Abstract: A motive power transmission device for a radio control model includes a shaft having an enlarged ball-like portion formed on one end of the shaft. A funnel-shaped groove is diametrically defined in and extends through the enlarged ball-like portion. A coupling is connected to the shaft and includes a cavity defined to universally receive the enlarged ball-like portion. Two holes are diametrically defined in the coupling and communicating with the cavity. The two holes communicate with the funnel-shaped groove when the enlarged ball-like portion is received in the cavity in the coupling. An annular groove is defined in an outer periphery of the coupling and communicating with the two holes. A pin extends through the holes and the funnel-shaped groove to connected the shaft with the coupling. A fixing member is received in the annular groove in to hold the pin in place.

Abstract: A fuel tank structure of a remotely controllable car. A fuel pipe is disposed in the fuel tank. A middle section of the fuel pipe has a fuel outlet by which the interior of the fuel pipe is divided into a first section and a second section. Two steel balls are respectively disposed in the first and second sections. The ends of the first and second sections proximal to the fuel outlet are respectively formed with a first and a second passages. The ends of the first and second sections distal from the fuel outlet are respectively formed with a first and a second receiving sections. The fuel pipe is formed with a first inlet between the first passage and the first receiving section and a second inlet between the second passage and the second receiving section.

Abstract: A mold and method for producing a two-stroke engine casing of a radio control model are to define a core cavity and a main cavity in the mold. A first core has a first end inserted into the mold and the core cavity is defined around the first end of the first core for forming a core and simplifying the manufacturing processes. The first core with the core is inserted into the main cavity to from the cylinder of the engine and the blocks of the core define grooves in the inner periphery of the cylinder of the engine.

Abstract: An engine of a radio control model usually has two types of igniting. An igniter uses two unidirectional bearings to combine the two types of igniting. The two unidirectional bearings each has a rotating direction different from each other.