Patent GB-190811713-A (GB)
Title: Improvements in Automatic Door Closers and Checks
Inventor: BARDSLEY JOSEPH
Filed: 1908-05-29
Granted: 1909-05-27
Abstract: 11,713. Bardsley, J. May 29. Door-closing apparatus; door checks.-Relates to door closers and checks of the kind described in Specification No. 7463, A.D. 1903, and comprises means which allow the device to be used on right or left hand doors without change in the interior mechanism or adjustment of the lever arm on the actuating-spindle, means for securing proper checking action at the proper point, and means for sealing the liquid in the check cylinder and excluding it from the spring chamber. Upon the usual angular portion 45. Fig. 5, of the actuating-spindle 40 is placed a disk 46, Fig. 11, having a hub 47, shoulders 48, 49, and recesses 50, 51. The inner end of the lever arm 52 is detachably secured on the hub 47 and carries a pivoted double-pointed pawl 53, which engages a toothed plate 54 mounted on the cap 55 closing the spring chamber 32, as shown in Fig. 5. The plate 54 has a depending key portion 60, which passes through a central opening in the plate 64 and is shaped to enter recesses 79 in the plate 62, Fig. 15. The plate 64, Fig. 13, has a depending lug 65, shoulder 66, and a recess 67 which receives the upper inwardly bent end of the spring 57. The lower end of the spring 57 is hooked on the shoulder 75, Fig. 16, of the cap frame 61, which is provided with a pivoted stop 76. The upper part of the stop abuts against a rigid shoulder 77, and the lower end is bevelled and engages a bevelled shoulder 78 on the frame 61. The shoulder 66 on the plate 64 co-operates with a stop 69 carried by a spring 70 which is fastened at its outer end by a screw on the cap 55. The depending lug 63 on the plate 62 co-operates with the stop-bar 76 and also with the lug 65 of the plate 64. When used on a left-hand door, the cap frame 61 is rotated to wind the spring from its lower end, the upper end of the spring being held stationary by the plate 64 and stop 69. When used on a right-hand door, the upper end of the spring is wound by the plate 64, and the lower end is held stationary by the engagement of the frame 61 and a stop 72 on the casing. The lever arm 52 has a reduced rearward extension 58 which is confined between the abutments 48, 49 on the plate 46. The arm is also provided with a screw 59 for engaging one of the recesses 50, 51. The outer end of the lever arm 52 is universally jointed to the forked end of an adjustable piece 86, which is engaged by a threaded rod 89 universally jointed to the door frame. The actuating-spindle 40 is connected to the piston 34, Fig. 6, in which is a valve 36. The cylinder 31 is provided with a by-pass 41, Fig. 19, controlled by the screw 42 and formed below the horizontal axial plane of the cylinder. A recess 43 is formed in the wall of the cylinder below the plane of the by-pass and cooperates with a port 44 formed in the piston 34. This auxiliary by-pass is only in operation for a short time during the latter part of the closing movement, and permits the closer to exert its maximum force in closing and latching the door. The collar 71, formed integrally with the partition 33 separating the liquid and spring chambers, is threaded on its inner surface to receive the lower threaded part of a long cylindrical bearing 80, preferably formed with an annular shoulder 81. The upper end of the bearing 80 is recessed at 82 to receive packing-material and a gland nut 83. The interior of the bearing 80 is formed with annular recesses 84 to minimize creeping of oil along the spindle. The stop-bar 76, Fig. 16, may be replaced by a vertically-movable spring-controlled rod.