Expansible chamber devices – With inspection window in expansible chamber wall portion – With lock
Patent
1992-09-10
1994-04-26
Denion, Thomas E.
Expansible chamber devices
With inspection window in expansible chamber wall portion
With lock
92 88, 92164, F01B 2526, F01B 2900, F01B 3100
Patent
active
053056825
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE ART
This invention relates to a piping/wiring lead-out mechanism which facilitates piping of fluid pressure conduits as well as wiring of switch lead wires to and from a rodless cylinder.
STATE OF THE ART
In a conventional rod type hydraulic cylinder with a piston rod, a driven part is attached to the fore end of a piston rod which is projected out of a fluid cylinder body. Therefore, the piston driving fluid pipes which are connected to a cover at the head end of the cylinder body are unlikely to become an obstacle to the movement of the driven part. The same applies to the lead wires of a piston sensor switch which is usually provided on a lateral side of a cylinder body for the purpose of stopping the piston in a predetermined position or for other purposes.
However, in a rodless cylinder as disclosed, for example, in U.S. Pat. No. 4,545,290 and Japanese Laid-Open Utility Model Application 64-45009, a moving member which is slid back and forth along a cylinder body is arranged to pass closely to piping and wiring components in the course of its movement, so that the operation of the moving member is very likely to be obstructed by a piston driving fluid piping which is connected to a particular position of a cover member at the head or rod end of the cylinder body or by the lead wires of a piston position sensor switch which are drawn out of the cylinder body in a random fashion.
With regard to lead wires of a piston sensor switch, it is conceivable to provide a groove longitudinally on a lateral side of a cylinder body and to mount the switch in the groove along with its lead wires in such a way that the lead wires can be drawn out through one end of the groove. However, this arrangement only permits to draw out the lead wires at one fixed position on the cylinder body, precluding the possibilities of drawing out the lead wires at any other arbitrary position.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide a rodless cylinder of a construction which permits to lead out operating fluid pressure pipes and/or lead wires of an electric switch or switches selectively at a position which would not contact and interfere with the movement of a moving member on the cylinder body or of a driven part attached to the moving member.
It is another object of the present invention to provide a wire lead-out mechanism for a rodless cylinder of the sort as mentioned above, the lead-out mechanism permitting to draw out lead wires of a piston position sensor switch at an arbitrary position of the cylinder body and to alter the position at which the switch is to be mounted on the cylinder body.
In accordance with the present invention, for achieving the above-stated objectives, there is provided a piping and wiring lead-out mechanism for a rodless cylinder having a piston fitted in a cylinder body for reciprocating movement therein and a moving member adapted to slide reciprocatingly along the cylinder body in synchronism with the movement of the piston, the lead-out mechanism essentially including: a port opened in each of end plates at the opposite ends of the cylinder to supply fluid pressure to a pair of pressure chambers defined by the piston; each of the end plates having fluid supply ports opened in lateral wall, outer end wall and lower side wall thereof to supply fluid pressure separately to each one of the pressure chambers; the fluid supply ports on each end plate being communicated with each other through passages formed in the end plate and cylinder body; a groove formed longitudinally on a lateral side of the cylinder body to mount and accommodate a switch and switch lead wires thereon; and a wire outlet member having a plural number of lead wire outlet holes in face to face relation with the groove and being relocatably fixed in the groove at an arbitrary position in the longitudinal direction thereof.
With the piping and wiring lead-out mechanism of the above arrangement, the operating fluid can be supplied to a pair of pressure chambers, which are def
REFERENCES:
patent: 2953118 (1960-09-01), Flick et al.
patent: 3511136 (1970-05-01), Thomas et al.
patent: 5103172 (1992-04-01), Stoll
Tol-O-Matic Sales brochure pp. 10-11 Mar. 1987.
Denion Thomas E.
SMC Corporation
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