Machine element or mechanism – Control lever and linkage systems – Elements
Patent
1991-12-20
1993-03-09
Denion, Thomas E.
Machine element or mechanism
Control lever and linkage systems
Elements
92 134, 92 137, F01B 3114, G05G 104
Patent
active
051918080
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to an actuator end stop arrangement and more particularly, for an actuator wherein linear motion is converted to angular motion, an end stop arrangement for the angular motion of an arm means which is driven by linear motion and delivers angular motion to a shaft.
The conventional end stop arrangement comprises large adjustment screws and lock nuts. However, such arrangements take up a great deal of space and it is an object of the invention to provide a simple construction which is effective and takes up less space than the conventional arrangement.
SUMMARY OF THE INVENTION
According to the invention, there is provided, an end stop arrangement for the angular motion of an arm means in an actuator wherein linear motion is received by the arm means and is converted by the arm means into angular motion and delivers such angular motion to a shaft, the arrangement comprising an assembly of a stop bar formed from a cylindrical rod but having a lengthwise slot therein, means for securing the stop bar to a fixed support within the actuator casing both in a sense lengthwise of the stop bar and angularly about its axis, a stop plate slidably secured in the slot and presenting a stop edge for engagement with the arm means, the position of the stop edge relative to the stop bar being adjustable by the insertion or removal of spacer means in the slot and engaging an edge of the stop plate remote from the stop edge.
BRIEF DESCRIPTION OF THE DRAWING
An embodiment of the invention will now be described, by way of example, with reference to the accompanying drawing, in which:
FIG. 1 is an elevation, partially in section, of an end stop arrangement, according to the invention, assembled in position in a fixed support within an actuator casing and shown in contact with arm means of the actuator; and
FIG. 2 in a section, to an enlarged scale, on line II--II in FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In the drawing, a stop bar 1 is formed from a cylindrical rod. A lengthwise slot 2 is cut in the stop bar 1. As shown, the bar I is relieved at each side of the slot 2 to provide two parallel wings 3. Two pairs of aligned holes are provided through the wings 3 near the upper and lower ends of the stop bar 1.
A cylindrical end part 4 is welded to the bottom end of the stop bar 1 and has an annular groove receiving an 0-ring 5 sealing a bottom bore 6 in the actuator casing 7. The bottom bore 6 has a shoulder 8 against which the end part 4 seats. The casing 7 also has an intermediate bore and an upper bore 10 aligned with the bore 6 and the stop bar 1 is housed within all three bores A cap 11 is bolted at 12 to the casing 7 and covers the bore 10. The cap 11 has a spigot 13 which enters the bore 10 and engages the upper end surface of the stop bar 1. A location peg 14 extends from the spigot 13 into the slot 2. Thus the stop bar 1 is secured in a lengthwise sense and in an angular sense.
A stop plate 15 is housed in the slot 1 and presents an upper stop edge portion 16 between the bores 9 and 10, a lower stop edge portion 17 between the bores 6 and 9, and a relief intermediate the edge portions 16, 17 and registering with the intermediate bore 9. On one side of the plate 15 adjacent to each edge 16, 17 is a circular recess 18 which receives a disc spring 19 slidably securing the plate 15 in the slot 2. Endwise movement of the plate 15 is limited by pins 20 inserted in the aligned holes in the wings 3 and spanning the slot 2. The position of the stop edge portions 16, 17 relative to the stop bar 1 is adjusted by the insertion or removal of spacer shims 21 in the slot 2 and engaging the edge 22 of the stop plate 15 remote from the stop edge portion 16, 17.
In FIG. 1 the arm means of the actuator is shown as two spaced limbs 23 of yoke which has an angular motion.
The end stop arrangement is assembled as follows. The disc springs 19 are located in the recesses 18. The pins 20 are fitted to the stop bar 1. The stop plate 15 and located disc springs 19 are inserted late
REFERENCES:
patent: 2729388 (1956-01-01), Ringham
patent: 2976844 (1961-03-01), Goldring
patent: 3104592 (1963-09-01), Sheesley
patent: 3371553 (1968-03-01), Miner
patent: 3958493 (1976-05-01), Fujita et al.
patent: 4265132 (1981-05-01), Robertson
Denion Thomas E.
Prime Actuator Control Systems Limited
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