Patent GB-1041888-A (GB)
Title: Clutch and rotation arresting mechanism
IPC: F16D71/00
Filed: 1964-09-29
Abstract: 1,041,888. Wrapping terminals with wire. INGERSOLL-RAND CO. Sept. 29, 1964 [Oct. 9, 1963], No. 39568/64. Heading B3E. [Also in Division F2] In a centrifugally actuated positive clutchbrake, particularly in a wire-wrapping tool, a clutch driving element 47 is axially cammed, against a spring 64, into claw engagement at 56, 57 with a clutch driven element 48 by centrifugal balls 52 responsive to driving element speed, and on clutch disengagement a stop sleeve 46 held from rotation but axially slidable with the driving element engages a slot 59 in the driven element to stop the latter in an adjustable predetermined position. As shown, a wire wrapping tool comprises an air motor 9 energized through a trigger-operated valve 13 and driving the clutch driving element through an epicyclic reducing gear comprising planets 16 on a carrier 18 and meshing a fixed ring 24 and a sun 15 on the motor spindle 14. The carrier rotates the clutch driving element through axially extending pins which allow relative axial movement. The balls 52 engage transverse facial grooves in the carrier and the clutch driving element, the outer ends of the groove in the latter having can surfaces 54. The clutch driven element is secured to a spindle 33 rotatably supported in a housing 29 by rollers 34. A spring biased bit driver 35 is keyed inside the spindle 33 for rotation therewith and axial sliding movement thereto. A bit housing 36 is secured in the housing 29 by a threaded chuck 37 and a lock pin 39, and supports a bit 40 having a head 41 slidably and drivingly engaging the bit driver 35. The bit 40 has peripheral and central longitudinal bores 43, 42 respectively receiving the wrapping wire and an electrical terminal or other member around which the wire is to be wrapped. The stop sleeve 46 is biased towards the clutch driving element by a spring 63 and comprises a tang which engages a groove 62 in the housing 29 and has a stop lug 60 engageable with the slot 59 in the clutch driven element. The spring 64 also urges a slipping clutch member 65 into frictional engagement with the clutch driven element. In operation, when the motor is energized and the carrier and clutch driving element reach a predetermined speed the latter is leftwardly cammed, to axially slide the stop sleeve 46 and disengage the stop lug 60 and thereafter to positively engage with the clutch driven element. On de-energization of the motor and deceleration of the carrier and clutch driving element the spring 64 rightwardly returns the clutch driving element from engagement with the clutch driven element which continues to be rotated by the driving element through the spring 64 and slipping clutch member 65 until the slot 59 is brought into alignment with the stop lug 60 which then engages the slot. To adjust the predetermined circumferential stopping position of the bit 40 a nut 32 is untightened, the housing 29 rotated with respect to the tool body, and the nut retightened. To provide greater continued rotation of the motor after de-energizing, to ensure sufficient rotation for engagement of the lug 60 and slot 59, means such as a differential pressure-actuated check valve may be employed to automatically vent residual air in the motor. In Fig. 7 (not shown) the centrifugal camming surfaces are provided on the epicyclic carrier, the stop sleeve is axially secured to the clutch driving element by lugs of a resilient split ring thereby eliminating the spring 63, the slipping clutch member is splined on an axially extending shank of the carrier, and the driven clutch member is integral with the spindle 33.