lock piecen.

1778 W. Pryce Mineralogia Cornubiensis 97 The adventurers have been often put to unnecessary expence in stemples and lock-pieces to secure the Mine from falling in.

1878 R. J. Hinton Handbk. Arizona p. lxvii Lock-piece, a piece of timber used in supporting the workings.

1956 J. C. Hartley et al. Anthracite Mech.-Mining Investig. 22 A possible third cause of bending was due to the misalinement [sic] induced at the lock piece by the setting device when the prop was being preloaded on erection.

1825 London Jrnl. Arts & Sci. 9 295 That part of the lifter [in a shearing machine]..has a projection or lock-piece, on one side, and a recipient on the other, to receive the projection of the next in succession.

1915 Jrnl. Amer. Soc. Naval Engineers 27 992 If split rings are used they should be fitted with springs to hold them out and with a lock piece to prevent too great expansion.

1975 Cycle World Mag. Nov. 48/1 Remove the cone (oil lock piece) from the bottom of the damper rod.

2013 Yanmar Diesel Engine Model 2 S iii. 20 Check the contact condition of the valve spring holder with valve lever and inspect the abrasion condition of contacting section of valve with lock pieces.

1837 Rep. Secretary of War on Bursting of Cannon 22 in U.S. Congress. Serial Set (25th Congr., 1st Sess.: Senate Doc. 16) I The true point of sight was determined, and marked at the swell of the muzzle and lock-piece of the guns.

1860 Ordnance Instr. U.S. Navy (ed. 2) 80 It is essential that the head of the primer should be placed flat and close upon the lock-piece, in order that the hammer may strike it fairly.

2013 R. Cusick Wellington's Rifles 64 It would wind the threaded bolt into the threaded vertical hole in the lock piece, sealing off the chamber once the ball and charge had been loaded.