TAILIEUCHUNG - Five Hundred and Seven Mechanical Movements Episode 9

Tham khảo tài liệu 'five hundred and seven mechanical movements episode 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | I----------- Mechanical i ---------------------------- 297. An escapement with a lantern wheel. An arm A carries the two pallets B and c. 29S. An old-fashioned watch escapement ị ị I 299. An old-fashioned clock escapement. I 300 and 301. A clock or watch escapement 300 being a front elevation and 301 a side elevation. The pallet is acted upon by the teeth of one and the other of tw escape-wheels alternately. 302. Balance-wheel escapement c ĨS the balance A B are the pallets and D is the escape-wheel. 303. A dead-beat pendulum escapement. The inner face of the pallet E and outer Movements. 75 face of I are concentric with the axis on which the pallets vibrate and hence there is no recoil. 304. Pin-wheel escapement somewhat resembling the stud escapement shown by 292. The pins A B of the escapewheel are of two different forms but the form of those on the right side is the best. i One advantage of this kind of escapement is that it one of the pins is damaged it can easily be replaced whereas if a tooth is damaged the whole wheel is ruined. I 305. A sĩngle-pĩn pendulum escapement. The escape-wheel is a very small disk with single eccentric pin it makes half a revolution for every beat of the pendulum giving the impulse on the upright faces of the pallets the horizontal faces of which are dead ones. This can also be adapted to watches. 7 s Mechanical Movements. Mechanical Movements. 306. Three-legged pendulum escapement raises one of the weighted pallets out of the The pallets arc formed in an opening in a wheel at each vibration. When the pendu-plate attached to the pendulum and the lum returns the pallet falls with it and the three teeth of the escape-wheel operate on weight of the pallet gives the impulse the upper and lower pallets alternately. I One tooth is shown in operation on the upper pallet. 310. Three-legged gravity escapement. The lifting of the pallets A and B is done i by the three pins near the center of the 307. A modification ot the above with .