Low torque automatic screwdriver
阅读：880发布：2022-02-04
专利汇可以提供Low torque automatic screwdriver专利检索，专利查询，专利分析的服务。并且A pneumatic powered screwdriver adapted for moderately high speed operation and automatic shutoff at relative low torque turning resistance. An axially disengagable clutch unit intermediately couples the motor drive to the output drive bit. Contained in the clutch unit is a sear or cutoff member which is cam shifted radially in response to clutch disengagement for enabling air supply interruption to the motor.，下面是Low torque automatic screwdriver专利的具体信息内容。
1. A powered screwdriver comprising in combination: a. an air motor having an inlet at which to receive a source of high pressure supply air; b. a drive end for work engagement with a fastener member to be rotationally driven; c. a clutch operative to couple the output of said motor to said drive end and operative to effectively uncouple said drive end from said motor output at an encountered fastener turning resistance corresponding to a torque oF predetermined value; and d. disconnect means operative concomitantly and in parallel with the uncoupling of said clutch to effect interruption of air supply to said motor, said disconnect means including: 1. a shutoff valve in said air inlet adapted to open and close the air supply to said motor; 2. a slidable throttle rod for operating said shutoff valve between its open and closed positions; 3. sear means movable radially relative to the axis of tool rotation between a first position effectively cocking said throttle rod against movement in a direction for closing said valve and a second position enabling said rod movement for closing said valve; and 4. first cam means on said drive end operably independent of the operation of said clutch for shifting said sear means from said first to said second position.
2. A powered screwdriver according to claim 1 in which the centroid of said sear is displaced from the axis of tool rotation whereby rotational forces aid to maintain said sear in said first position.
2. a slidable throttle rod for operating said shutoff valve between its open and closed positions;
3. sear means movable radially relative to the axis of tool rotation between a first position effectively cocking said throttle rod against movement in a direction for closing said valve and a second position enabling said rod movement for closing said valve; and
3. A powered screwdriver according to claim 2 in which said sear is supported transversely intersecting the axis of said tool with its centroid definitively located to one side of said axis and there is included biasing means acting against said sear directionally of said centroid urging the sear into said first position.
4. A powered screwdriver according to claim 3 in which said cam means is rotationally supported on the axis of said tool and includes a plurality of lobes displaced at angular intervals about its periphery, at least one of said lobes being effective concomitantly with uncoupling of said clutch to radially shift said sear means from said first to said second positions in opposition to said biasing means.
4. first cam means on said drive end operably independent of the operation of said clutch for shifting said sear means from said first to said second position.
5. A powered screwdriver according to claim 4 in which said throttle rod is supported on the axis of said tool extending through an axially parallel bore in said sear means, said bore being located radially offset with respect to said tool axis while said sear means is in said first position to effect cocking of said throttle rod and is shifted to relatively approach axial coincidence when said sear means is shifted to said second position for uncocking of said throttle rod.
6. A powered screwdriver according to claim 5 in which said throttle rod includes a radial wall adjacent said sear means, and a wall segment of said sear means contiguous to said bore axially interferes with said throttle rod wall to effect said throttle rod cocking.
7. A powered screwdriver according to claim 6 including a housing supportably enclosing said motor, said drive end, said clutch and said disconnect means, and in which said drive end is axially slideable inward of said housing in response to a pressing work engagement against a fastener to be driven and said throttle rod is axially moveable in conjunction with said drive end to effect opening of said shutoff valve.
8. A powered screwdriver according to claim 7 in which said throttle rod operatively moves inwardly toward said drive end to effect closing of said shutoff valve in response to shifting of said sear means to said second position.
9. A powered screwdriver according to claim 8 including biasing means to operatively effect a driving relation between said motor, said drive end, said clutch and said disconnect means at the onset of work engagement with a fastener and to restore said driving relation on post-torqued removal from work engagement with the fastener.
10. A powered screwdriver according to claim 1 in which said clutch comprises a first annular member having a plurality of lobes displaced at angular intervals about a radial face of said member with adjacent of said lobes defining an axial recess therebetween, a second annular member having a plurality of axial cutouts circumferentially opposite the recesses of said first member, interfitting means extending between each of said opposite recess and cutout to effect a rotational couPling relation between said first and second members, biasing means acting to urge one of said members toward the other for maintaining said coupling relation and second cam means operative to uncouple said first and second members in response to encountering of said predetermined torque value by said drive end.
11. A powered screwdriver according to claim 10 in which said interfitting means comprise balls and said second cam means is defined by a surface pitch merging at least one common end of said recesses to its contiguous lobe.
12. A powered screwdriver according to claim 11 in which said first annular member is operatively connected to said motor and said second annular member is operatively connected to said drive end.
13. A powered screwdriver according to claim 11 in which the centroid of said sear is displaced from the axis of tool rotation whereby rotational forces aid to maintain said sear in said first position.
14. A powered screwdriver according to claim 13 in which said sear is supported transversely intersecting the axis of said tool with its centroid definitively located to one side of said axis and there is included second biasing means acting against said sear directionally of said centroid urging the sear into said first position.
15. A powered screwdriver according to claim 14 in which said first cam means is rotationally supported on the axis of said tool and includes a plurality of lobes displaced at angular intervals about its periphery, at least one of said lobes being effective concomitantly with uncoupling of said clutch to radially shift said sear means from said first to said second positions in opposition to said second biasing means.
16. A powered screwdriver according to claim 15 including a housing supportably enclosing said motor, said drive end, said clutch and said disconnect means, and in which said drive end is axially slideable inward of said housing in response to a pressing work engagement against a fastener to be driven, and said throttle rod is axially moveable in conjunction with said drive end to effect opening of said shutoff valve.
17. A powered screwdriver according to claim 16 in which said throttle rod operatively moves inwardly toward said drive end to effect closing of said shutoff valve in response to shifting of said sear means to said second position.
18. A powered screwdriver according to claim 17 including biasing means to operatively effect a driving relation between said motor, said drive end, said clutch and said disconnect means at the onset of work engagement with a fastener and to restore said driving relation on post-torqued removal from work engagement with the fastener.
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