Patent GB-302213-A (GB)
Title: An improved balancing machine for determining the amount and location of unbalance in rotary bodies
IPC: G01H1/00
Filed: 1927-09-12
Abstract: 302,213. Marks, E. C. R., (Gisholt Machine Co.). Sept. 12, 1927. Indicating; vibrations, indicating and registering. - Comprises a construction of vibration meter for indicating the maximum amplitude of vibrations of a rotor undergoing a balance test. At one corner of the base of the machine is a pedestal on which is a vertical bracket having a split socket to receive a post 29, adjustable on which is a bracket with split arms 32, 33 for supporting the vibration meter and transmitting mechanism. The casing of the instrument is mounted on a hollow casting 46 with a tubular stem 48 projecting into the split end of an arm 106 mounted on a post 108 carried by the split arms 32, 33, the arm 106 being locked against turning by a pin 118 engaging a slot 117 in the arm. Vibration meter.-The casing comprises a back plate 35, a front wall 37 with a large opening closed by a glass plate 39, and a dial frame plate 42 within which is a dial 44. The main arbor 55 of the instrument is mounted in jewelled bearings 51, 54 in the back plate and dial disc respectively. Keyed to the arbor is the hub 56 of a four-arm spider 57 to opposite arms of which is attached the pointer 59 also mounted on the arbor, the upper end of the pointer being bent to extend through the circular slot 61. Secured to the arbor is a short brass sleeve 65 to the centre of which is attached a very thin steel tape 67 attached at the other end to a spring 69. A pair of tapes 72 are attached to the sleeve on each side of the tape 67 and on the opposite side of the sleeve being connected at their lower ends by an equalizer 73 to a rod 75. Overlying the front of the dial 44 is a registering pointer 76 which is moved by a lug on the spider adapted to engage a bent tailpiece on the pointer 76 extending through an arcuate slot in the disc 44. This pointer is carried on a short arbor 77 journaled at one end in the bearing block 78 and at the other end in the top end of a plate 80 pivoted at the lower end on fixed conical points 88 the plate being pressed by a spring-urged pointed pin 81 against the arbor 77 so that the pointer 76 remains in whatever position reached. A sleeve 94 carrying a disc 97 with a pin serves for zeroizing the pointer 76 by engagement with a lug thereon, stops engaged by the pin limiting its movement and determining the zero. The casing is illuminated by electric lamps 167 in the top. Transmitting mechanism. - The arm 106 is mounted at the upper end of the post 108 which may be adjusted vertically by means of a screw 111 with a ball thrust. The arm 106 is connected by an offset extension 116 to a bracket 115 sliding on the post 108 and acted upon by a spring 114. A horizontal bar 120 seated in the part 116 has mounted at one end a block 130 connected to it by two pairs of steel tapes arranged at right angles. A lever bar 138 is attached to the block 130 by a bracket. The free end of the lever plays in a vertically slotted bracket 139 mounted on the end of the beam 120. The pull rod 75 is connected to the lever 138 by a hollow member 140 having an adjustable conical seat 143 for a conical pin 147 carried by the lever 138. Attached to the lever 138 by a screw 144 adapted to engage any of a series of spaced holes 145 is a bracket to which the upper end of the rod 148 is connected by a conical pin and seating similar to the connection to the rod 75 but inverted. This rod which is screwed is passed through a cylinder 159 and ends in a piston 162 between which and the top of the cylinder is a spring. The bottom of the cylinder is connected by a steel tape to a pin which is slipped into slots in a U-shaped bracket adapted to be clamped at any of a series of holes 150 in a horizontal bar 149 secured to the frame 14, the holes being vertically under the holes in the bar 138. The length of the rod 148 may be altered by adjusting the nut 163.