Please select the most similar patent number from A, B, C and D. Which number is?
A handle-operated left/right angle-adjustable parasol comprising a canopy adjusting mechanism and a transverse rod rotating mechanism. The transverse rod rotating mechanism is provided at the middle part of a transverse rod. The front end of a tilted rod is rotatably connected to the transverse rod rotating mechanism. The lower end of the transverse rod is rotatably connected to a sliding block via the canopy adjusting mechanism. The canopy adjusting mechanism comprises a transverse rod connector, an upper clutch gear, a lower clutch gear, and a handle. The upper clutch gear is fixedly connected to the transverse rod. The lower end of the transverse rod connector is rotatably connected to the sliding block. The upper end of the transverse rod connector runs through the lower clutch gear and is rotatably connected to the upper clutch gear. The lower clutch gear is capable of making axially limited movements along the transverse rod connector. The handle is rotatably provided outside the upper clutch gear and is abutted against the upper end of the lower clutch gear. When the handle is rotated downwards, the lower clutch gear is moved downwards and separated from the upper clutch gear, and the handle is rotated left or right to rotate the transverse rod to make left/right adjustments of the canopy. The present utility model is structurally simple and reasonable, is convenient to operate, provides steady and reliable positioning, implements sun-blocking angle adjustment of the canopy simply by operating the handle, and provides enhanced practical performance.
A: A joint energy storage assistance mechanism (100). One end of a sleeve (10) of the joint energy storage assistance mechanism serves as a first pivot end (100a); a one-way clutch rack (40) is capable of sliding axially with respect to a sliding rod (20) and one end of the one-way clutch rack (40) serves as a second pivot end (100b); an elastic structure (30) abuts between the sliding rod (20) and the sleeve (10). When a joint requires energy storage, the one-way clutch rack (40) is switched to a fixed state, the sliding rod (20) moves along with the one-way clutch rack (40), and kinetic energy of the sliding rod (20) is converted into potential energy of the elastic structure (30) to achieve energy storage. When the one-way clutch rack (40) and the sliding rod (20) return, the elastic structure (30) releases energy to drive the one-way clutch rack (40) and the sliding rod (20) to move in an opposite direction, thereby yielding a pushing assistance effect on a movable arm (300). When the one-way clutch rack (40) is switched to a free state, the one-way clutch rack (40) is capable of sliding with respect to the sliding rod (20), and the elastic structure (30) cannot achieve energy storage. The present invention also relates to a robot joint structure and a robot. Energy storage and energy release can be achieved by promptly catching and releasing the one-way clutch rack (40).
B: Disclosed in the present invention is an electric winch, belonging to the technical field of winches. The object of the present invention is to provide an electric winch having long service life and high reliability, and the main points of the technical solution thereof are in that: a U-shaped frame is included, a winch wheel is provided on the U-shaped frame, the winch comprises a winch shaft rotatably connected to the U-shaped frame, two baffle plates are provided on the winch shaft, one end of the winch shaft extends out of the U-shaped frame and is driven by a motor, a worm gear box is provided between the motor and the winch shaft, a clutch is further provided between the worm gear box and the winch shaft, the clutch comprises a clutch housing fixedly provided on an outer side wall of the U-shaped frame, a transmission gear shaft sleeve and a clutch gear shaft sleeve fitting the transmission gear shaft sleeve are rotatably provided in the clutch housing, and a connecting key inserted into a key slot is provided on an output shaft of the worm gear box. The arrangement of the transmission gear shaft sleeve and the clutch gear shaft sleeve in an engagement manner achieves the effects of prolonging the service life of the clutch and enhancing the working reliability of the clutch.
C: Provided is a new type of bicycle handle having a heating function, comprising a heating device and a brake lever; the heating device is a sleeve (5) fixed on the surface of the handle; the surface of the sleeve (5) is provided with an accommodating chamber (51); the accommodating chamber (51) is equipped with a graphene heating film (52); an electrode is disposed on the graphene heating film (52), and the electrode is fixedly connected to an external electrical connector (53) by means of a wire; the brake lever comprises a column (3), an operating handle (1), a positioning rod (2), and a rebound device (4); the column (3) is fixedly connected to the upper side of the handle; the operating handle (1) is rotatably connected to the column (3) by means of a middle part, and the column (3) is divided into an inner pressing part (11) and an outer connecting part (12); the pressing part (11) is fixedly connected to the inner side of the handle by means of the rebound device (4); the positioning rod (2) is an &#34;L&#34; shape consisting of a horizontal rod (21) and a vertical rod (22); the middle part of the vertical rod (22) is fixedly connected to the outer end of the connecting part (12); the top of the vertical rod (22) is fixedly connected to a brake steel rope, and the end part of the horizontal rod (21) is supported on the outside of the handle. The bicycle handle can effectively heat the human hand and reduce the heat loss of the palm when braking.
D: A combination-type hand-push opening and closing hanging umbrella, comprising an umbrella base (1), an upright column (2), a crossbar (6), an inclined bar (5), and an umbrella frame, the umbrella base (1) comprising a bottom base (1.1) and a fixed base (1.2), the bottom base (1.1) being made by welding a bottom plate (111) to a vertical square pipe (112), a square groove (121) sleeved with the vertical square pipe (112) protruding from the fixed base (1.2), positioning bosses (122) capable of sleeving with several connecting sleeves (1.3) being formed on the fixed base (1.2) at intervals in the circumferential direction, the inner diameter of the connecting sleeve (1.3) matching the outer diameter of the upright column (2) and the positioning bosses (122), the lower end of the connecting sleeve (1.3) being sleeved on a positioning boss (122) and the side part of the upper end of the connecting sleeve (1.3) being fixed to the vertical square pipe (112), the lower end of the upright column (2) being inserted into the connecting sleeve (1.3) and the upper end of the upright column (2) being provided with a top cap (3), and the top cap (3) being connected to the inclined bar (5), the top caps (3) of different umbrella frames being connected and secured by means of connecting pieces (4); the design is novel, the structure is simple and rational, and assembly is quick and convenient; the shaded area is greatly increased by spliced assembly, whilst also achieving the objectives of saving the labour of opening the umbrella, convenient adjustment and securing, and strong practical performance.
Answer: D