Appeal 2007-0605
Application 10/231,771
1 7. A pressure controlled valve means includes a variable orifice the
2 size of which is automatically adjusted in response to the pressure
3 of fluid passed to hydraulic cylinders and pistons. (col. 2, ll. 54-
4 57).
5 8. Referring to figure 1, a pressure relief valve 27 is provided on
6 pump 24 so that if a predetermined pressure is exceeded fluid will
7 pass from pump 24 directly through line 28 back to reservoir 25.
8 The reservoir 25 is connected by line 29 to the pressure controlled
9 valve to receive fluid from the valve. (col. 3, ll. 52-60).
10 9. When it is desired to open the press, dump valve 35 is opened.
11 (col. 4, ll. 9-10).
12 10. Referring to figure 2, valve means 22 includes a valve body having
13 a partition 36 including a central opening 37. Partition 36 defines
14 first and second valve chambers 38 and 39. Tapered pin 40 is
15 positioned to extend into central opening 37. The taper of pin 40
16 varies the effective size of the opening to provide a variable orifice
17 depending upon the longitudinal position of the tapered pin.
18 Tapered pin 40 terminates at piston 41. Compression spring 42,
19 which may be adjusted by knob 31, exerts a biasing force on piston
20 41, tending to decrease the effective size of the opening. Piston 41
21 defines with a part of the valve body a third chamber 43 which is
22 in communication with the first chamber 38 by means of control
23 hydraulic line 30. (col. 4, ll. 19-35).
6
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Last modified: September 9, 2013