Patent GB-104349-A (GB)
Title: A Method of and Means for Ascertaining th Height and Distance of Aerial Objects.
Inventor: LANGLEY JAMES ROBERT
IPC: G01C3/00
Filed: 1916-01-29
Abstract: 104,349. Roebuck, A. C. Jan. 22, 1916. Carriage stops; line-locking devices; alarms; paper-shelves.-(1) A stop-bar 69. shown in rear elevation in Fig. 3, at the rear of and below the platen carries tabulating-stops 115, a margin stop 103, and a line-locking and bell-ringer stop 135 provided with a finger 137 extending above a scale bar 138, the paper-shelf normally resting on the scale bar and being tiltable forwards to permit of inspection of the finger and the scale. The stops 103, 135 are locked on the stop-bar by catches 132, 136 respectively. (2) The margin stop 103 carries a pivoted and spring-pressed stop-member 133 which is adapted to enter a pocket 102 on a fixed stop 99 and can be tilted for margin-release. The stop 99 consists of a lever pivoted on a pin a and secured in contact with the framework B. (3) The stop 135 carries a bell-crank 140 for engaging a bell-hammer 144, and a pin 149 on a lever 148 which is connected by a link 150, a bell-crank 151, Fig, 4, and a link 153 to a locking-bail 145, adapted to engage lugs 146 on the key-levers. The link 153 is provided with an L.slot 154 engaging a pin 155 on the bail 145, and on depressing a release-key 156 the link 153 is lifted and a spring 147 retracts the bail, the pin 155 entering the horizontal arm of the slot. It a key is in the depressed position when the lever 148 is operated, the movement is taken up bv a slot-connexion between the parts 150, 151, and on releasing the key a spring 152 moves forward the link 153. Letter-spacing mechanism.-(1) The universal bail 22, Fig. 5, operated by heels on the typelevers 15, can enter a groove in the type-lever seg. ment 16 and is formed, for the purpose of discharging dust, with an apertured part which slopes towards the rear. (2) The universal bail is secured to a frame 76 which is supported at the front by a pin 77 and at the rear by levers 73 connected to a returning-spring 74. (3) An escapement wheel 71 geared to a rack 64 on the carriage c, co-operates with an escapement comprising a fast dog and a loose dog 85, Fig. 3, which can slide tangentially to the escapement wheel for spacing and can also move radially to the escapement wheel for carriage-release, a spring 88 normally pressing the dog towards the escapement wheel. The fast dog is formed on a bracket 81 on the frame 76 and the loose dog 85 is formed with slots 87, 86 mounted on screws 83, 84 on the bracket, the slot 86 permitting of longitudinal and lateral movement of the dog. Space-key actions.-The space-key frame is provided with a cam engaging a lever which is pivoted in the base of the machine and engages an arm on the frame 76. Tabulating-mechanism; carriage-releasing arrangements.-(1) The stop bar 69, Fig. 3, is trunnioned with longitudinal freedom in the carriage and a spring 121 is provided for cushioning the impact of the tabulating-stops 115 on a tabulating- dog 101. The dog is yieldingly lifted on depressing the tabulating-key, and is formed with a stop 106 and a rebound-preventing stop 108 arranged at the end of an incline 107. The dog 101 consists of a lever pivoted at a and formed with a lug 109 normally resting on a lever 100, which is pivoted at a and is formed with a lug 110, a spring 111 being arranged between the lugs 109, 110. The lever 100 engages a lever 96 connected to the tabulating-key. (2) The stops 115 straddle the stop-bar 69 and are locked by the engagement of a rod 117, Fig. 6, with lugs 116 on the stops. Engagement is maintained by a spring connected to a special stop provided with lugs for limiting the rocking movement of the stop bar. On rocking the stop bar, the stops can be detached. (3) On operating the tabulating-key, the dog 85 is released by means of a lever 90, Fig. 3, provided with a pin 93 for engaging the tail 89 of the dog and with a tail 95 engaging a pin 112 on the lug 110. The dog-spring 88 is connected to the lever 90. The feed-rack 64 is carried by levers 65 and can be lifted for general release by depressing a finger 66. One of the levers 65 is provided with a screw 68, Fig. 6, which normally rests on the stop-bar 69, engagement being maintained by a spring 67. Back-spacing mechanism.-The back-spacing key rocks a lever 127, Fig. 9, carrying a pawl 129, which projects through a slot in the plate 104 and is adapted to engage the rack 64. The pawl is connected to a spring 131a and is formed with a tail 131, which moves between two stops on the lever 127. The slot limits the feed move. ment of the pawl and normally holds the pawl disengaged. The pawl is formed with a lug 130, which engages the rear face of the rack and prevents the rack from tilting.