McHargue v. Stokes Division of Pennwalt

686 F. Supp. 1428, 1988 U.S. Dist. LEXIS 5002, 1988 WL 52423
CourtDistrict Court, D. Colorado
DecidedMay 24, 1988
DocketCiv. A. 86-A-1301
StatusPublished
Cited by3 cases

This text of 686 F. Supp. 1428 (McHargue v. Stokes Division of Pennwalt) is published on Counsel Stack Legal Research, covering District Court, D. Colorado primary law. Counsel Stack provides free access to over 12 million legal documents including statutes, case law, regulations, and constitutions.

Bluebook
McHargue v. Stokes Division of Pennwalt, 686 F. Supp. 1428, 1988 U.S. Dist. LEXIS 5002, 1988 WL 52423 (D. Colo. 1988).

Opinion

MEMORANDUM OPINION AND ORDER

ARRAJ, District Judge.

This case involves a work-related inquiry sustained by plaintiff Jeff McHargue (“McHargue”), an employee of Denver Plastics, Inc. (“Denver Plastics”), when his hand was caught and crushed between the platens of a plastic injection molding machine manufactured by defendant Stokes Division of Pennwalt (“Stokes”). At the present time, Stokes is the sole defendant. 1 In their complaint, plaintiffs Jeff and Julia McHargue seek damages against Stokes under theories of negligence, warranty, and strict liability.

This matter is now before the court on defendant Stokes’ motion for summary judgment. The parties have submitted briefs, affidavits, and other documentation in support of their respective positions, and oral argument was heard on May 13, 1988.

BACKGROUND

Plaintiff Jeff McHargue began working for Denver Plastics as an operator in 1981, and was promoted to “first shift supervisor” approximately 18 months later. As first shift supervisor, McHargue was responsible for instructing new operators on the use of the plastic injection molding machines at Denver Plastics and for assigning operators to work the various machines. Additionally, upon arriving at the plant on Monday mornings, McHargue would turn on the machines that were going to be used and make whatever adjustments were necessary for the machines to function properly.

On the Monday morning of February 13, 1984, McHargue was working on a 300 ton plastic injection molding machine (known to employees as the “Blue 300”) when the machine unexpectedly closed on his hand. The Blue 300 was manufactured by defendant Stokes and sold to Denver Plastics in 1977. Plaintiffs’ claims are grounded upon their contention that the design of the Blue 300 is defective, rendering the product unreasonably dangerous. 2 Accordingly, in or *1431 der to fully appreciate the issues before the court on this motion, it is necessary to have some familiarity with the design of the injection molding machine in question.

Plastic injection molding, in general, is a method by which granular plastic material is softened in an electrically heated cylinder and forced by a plunger under high pressure through a nozzle into a relatively cool mold. The two halves of the mold are held together hydraulically under many tons of force to prevent leakage of the material during the high pressure injection cycle. The mold itself is kept relatively cool in order to harden the plastic just as soon as it fills the cavity.

The plastic injection molding machine in question consists in large part of two platens, upon which may be fastened the two halves of a mold. One platen moves horizontally to open and close the mold; the other remains stationary. When the two halves of the mold are brought together, heated plastic under high pressure is forced into the cavity created by the mold. After the plastic has cured, the movable platen returns to its original position, and the plastic product is either ejected automatically from the mold or removed manually.

The Blue 300 may be operated in either an automatic, semi-automatic, or manual mode. In all three modes, the operator’s position is at the front of the machine. The operator is kept clear of the mold area by means of safety gates located at the front and rear of the machine. However, the operator can gain access to the mold area by raising either the front or rear safety gate. When either safety gate is opened, the machine should stop cycling to prevent injury to the operator.

In the automatic mode, the opening and closing of the mold is controlled by an automatic timing device. The platens open and close automatically, and the plastic product is automatically ejected from the mold. In the semi-automatic mode, the cycling of the machine is still controlled by a timer, but the operator also controls the machine by means of the sliding gate locate ed at the front of the machine. The operator opens this gate at the end of the cycle and manually removes the plastic product. He or she then closes the front gate, allowing a new cycle to begin. In the manual mode, the operation of the platens is accomplished by the operator, who presses control buttons to open and close the mold.

The machine in question is equipped with a number of safety devices designed to protect operators and other persons who might come near or come in contact with the mold area. When the front safety gate is opened, three such safety devices are triggered which should prevent the platens from closing. First, there is an electronic interlock which breaks the electric circuit that would otherwise operate to close the platens. Second, there is a hydraulic interlock which prevents the hydraulic components from operating. Third, there is a mechanical safety device that drops into place when the front gate is opened. This device consists of a metal bar that is threaded into the movable platen and which must pass through a hole in order for the platen to close. When the front gate is opened, a pawl drops down and blocks the hole so that the steel bar cannot pass through. It may be important to note that in order for the mechanical safety device to function, it must be manually adjusted each time the mold is changed.

In contrast, there was only one safety device associated with the rear safety gate on the date of the accident. This device is an electrical interlock, similar to the one associated with the front gate, which operates to break the electric circuit that would otherwise close the platens. Additionally, there is evidence that the rear safety guard originally had a lock which precluded access to the mold area from the rear unless the lock was opened with a special key. However, at some point this lock was modified so that a key was no longer required. No evidence was submitted as to who modified the lock or when the modification may have been made.

A number of warnings signs are also affixed to the Blue 300. These were placed on the machine at the time of its manufacture and were on the machine on the date *1432 of the accident. Of particular importance are the following:

1. A yellow and black sign on the front safety gate which identifies when the safety devices for the front and rear gate should be checked and the procedure to be used in performing such tests.

2. Signs affixed to both the front and rear of the machine which state: “DANGER. Never place hands or any part of the body inside the die area without first shutting off the motor and locking out the disconnects except when removing molded parts thru the front safely gate.”

The Blue 300 makes use of several timers which control the timing of various machine functions, including closure of the platens. The timers are not manufactured by Stokes, but rather by a third-party, Eagle Signal Company. These timers are a “plug-in” component of the machine, and are therefore easily inserted and removed. At the time of its sale, the machine in question had a set of Eagle timers in place. However, Eagle timers can be purchased through local suppliers, and the timers on the Blue 300 are interchangeable with timers on other Stokes machines at Denver Plastics.

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Cite This Page — Counsel Stack

Bluebook (online)
686 F. Supp. 1428, 1988 U.S. Dist. LEXIS 5002, 1988 WL 52423, Counsel Stack Legal Research, https://law.counselstack.com/opinion/mchargue-v-stokes-division-of-pennwalt-cod-1988.