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Impact Wrench: Centrifugal-Dog Clutch on a Reversible Air Motor
Louis Fosnot's impact wrench (Independent Pneumatic Tool, US 2,425,793, 1947). A reversible vane air motor turns a carrier that drags a heavy slotted hammer round with it. Centrifugal force throws two sliding dogs out of the hammer to strike the jaws of the anvil, which carries the socket; on each blow the hammer recoils, cam slots pull the dogs back in, and the motor, which never stops, spins the hammer up for the next blow. The blows land at the largest radius, so a small tool hits hard.
The patent gives no sizes or materials beyond a light-metal case, and leaves the motor's ports to the trade; the motor is taken as a bought part. The picture: the patent's sheet 1.
高级
2 days
说明
1
1
Fit valve, trigger and nipple in the cast case
Fit valve, trigger and nipple in the cast case
Use the motor case and side handle cast in one piece of light metal. Fit the spring-closed throttle valve (4) in the handle's air passage (3), the trigger block (5) to open it, and the hose nipple (6) at the passage's end.
此步骤所需材料：
工具电机壳1 个
节流阀1 个
工具扳机1 个
软管螺纹接头1 个所需工具：
活动扳手2
2
Mount the vane motor
Mount the vane motor
Clamp the vane motor's cylinder (13), fixed against turning, between its end plates (14) in the case. The plates carry ball bearings (15) for the rotor's shaft ends (16); the rotor (9) sits off-centre with sliding blades (10) in its slots (11).
此步骤所需材料：
叶片式气动马达1 个
滚珠轴承2 个所需工具：
台式压力机3
3
Fit the reversing valve
Fit the reversing valve
Fit the turning reversing valve (22) in the case between the rotor and the throttle valve, with its handle (23) outside: one way the motor screws up right-hand threads, the other way it undoes them.
此步骤所需材料：
正反转换向阀1 个所需工具：
活动扳手4
4
Pin the dogs into the hammer
Pin the dogs into the hammer
Slide one rectangular dog (47) into each end of the hammer's cross-slot (46). Press a pin (48) through the bore (49) of each dog so its ends stick out into the hammer's radial slots (50), letting the dog slide in and out but not fall out. Ours: arbor press.
此步骤所需材料：
冲击离合器锤体1 个
冲击块2 个
钢销2 个所需工具：
台式压力机5
5
Build the carrier round the hammer
Build the carrier round the hammer
Put the hammer on the carrier shaft (38) through its centre openings (54). Fit the lower plate (37) on the shaft's hexagon (39). The pin ends now ride in the curved cam slots (53) of both plates.
此步骤所需材料：
离合器锤架1 个所需工具：
台式压力机6
6
Set the carrier in the anvil
Set the carrier in the anvil
Lower the carrier into the anvil cup (27): a thrust plate (43) between the lower plate and the anvil's end wall (30), the shaft's lower end (41) in a roller bearing (42) inside the hollow spindle (26). The dogs face the anvil's jaws (32) through its side openings (31).
此步骤所需材料：
冲击离合器砧座1 个
止推板1 个
滚柱轴承1 个所需工具：
台式压力机7
7
Couple to the motor and bolt on the housing
Couple to the motor and bolt on the housing
Engage the rotor's shaft end in the upper plate's socket (44). Bolt the clutch housing (24) to the motor case; its bushing (25) carries the anvil spindle. Ours: wrench for the bolts.
此步骤所需材料：
离合器壳1 个
金属衬套1 个所需工具：
活动扳手8
8
Fit the socket and run it
Fit the socket and run it
Put a socket (28) of the nut's size on the spindle. Ours: connect an air hose from a compressor. Run the nut down; once it is tight the dogs strike the jaws in rapid blows. On each blow the hammer recoils and the cams draw the dogs in until the carrier spins it up again.
此步骤所需材料：
扳手套筒1 个所需工具：
空气压缩机
压缩空气软管材料
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