P.J. In this products liability case, plaintiffs appeal from a directed verdict entered in favor of defendants. Plaintiff Hezekiah Reeves was injured when a power press unexpectedly cycled, crushing Reeves’ right hand so that the fingers had to be medically amputated. Suit for personal injuries was brought against defendants Cincinnati, Inc., the manufacturer of the press, and Addy-Morand Machinery Co., the dealer arranging the sale of the press to Reeves’ employer, General Motors Corporation. At trial, plaintiffs introduced evidence to support theories of recovery for negligent design of the press and failure to provide warning of the dangers associated with the press. After plaintiffs rested, the trial court granted a directed verdict, reasoning that the evidence was insufficient to create issues submissible to the jury as to whether the press was unfit for its intended purposes or whether Cincinnati failed to use reasonable care to eliminate foreseeable risks. We reverse and remand for trial.
In determining whether to grant a motion for a directed verdict, the trial court must view the evidence in a light most favorable to the nonmoving party and determine whether a prima facie case is thereby established.
Clery v Sherwood,
When, as in this case, theories of negligence and implied warranty are both premised on an allegedly improper design of the product, the legal elements of the two theories converge to the point of identicalness; proofs that suffice for one theory will suffice for the other; proofs that fail to establish a prima facie case on one theory are equally inadequate for the other. See
Prentis v Yale Mfg Co,
*185 Specifically, plaintiffs’ theory of recovery is that the press unexpectedly and spontaneously cycled for unknown reasons, but that this is a common and foreseeable occurrence of working with presses. Contending that Cincinnati should have designed and implemented more adequate safety devices, plaintiffs primarily relied on Cincinnati’s failure to provide an interlocking barrier guard integrated into the clutch mechanism activating the cycling process of the press. Plaintiffs’ expert witness opined that an interlocking barrier guard could have been included by Cincinnati as part of the design of the press and that, if it had been installed, an accident of the nature causing Reeves’ injuries would have been rendered "virtually impossible.”
Plaintiffs’ theory, if supported by sufficient evidence, is viable under products liability law. "A product may be rendered unreasonably dangerous by the omission of a safety device. Furthermore, where an injury is reasonably foreseeable, the trier of fact must determine whether a safety device should have been put on the product by the manufacturer.” Scott, supra, p 670.
Whether an alleged design defect is actionable under theories of negligence and implied warranty is decided with reference to the risk-utility balancing test.
Prentis, supra.
The precise burden imposed on the plaintiff by this test was delineated by the Supreme Court in
Owens v Allis-Chalmers Corp,
Our conclusion that the plaintiff did not present a prima facie case is based on the lack of evidence concerning both the magnitude of the risks involved and the reasonableness of the proposed alternative design. Although from the testimony of plaintiff’s expert one might infer that a forklift rollover and the injuries resulting from being pinned under the overhead protective guard were foreseeable, neither his testimony nor any other evidence on the record gave any indication how likely such an event might be. In conjunction with this uncertainty, the record also produces no indication how the use of any of the driver restraints would affect a forklift operator’s ability to do his or her job or the operator’s safety in other circumstances. [Id., pp 429-430.]
Additionally, the Court noted that particularly "where the magnitude of the risks is quite uncertain because it is dependent upon the unknown incidence of forklift rollovers, an examination of the effects of any proposed alternative design must bear a heavy burden in determining whether the chosen design was unreasonably dangerous.” Id., p 430. In arriving at its holding that the evidence presented by that plaintiff was insufficient, the Court emphasized the lack of evidence as to the effectiveness and feasibility of driver restraints and of the costs of the incorporation of restraints into the design.
Other cases illustrative of the approach taken in
Owens
have been decided by this Court. See
Kinzie
*187
v
AMF Lawn & Garden, Division of AMF, Inc,
Allen Bradley next contends that Scott failed to present sufficient evidence to establish defective design according to Owens v Allis-Chalmers Corp,414 Mich 413 ;326 NW2d 372 (1982). Owens established that the plaintiff must present evidence concerning the magnitude of the risks involved and the reasonableness of any proposed alternative design. Owens, supra, p 432. Allen Bradley’s expert testified that the company began producing switch guards sometime after 1955. Two guards were introduced at trial which cost approximately $1 each to produce. It was obvious that the proposed guards would not affect the worker’s ability to perform his job. Allen Bradley’s expert stated that the guards were developed to avoid accidental activation. Therefore, it is apparent that Allen Bradley was aware of the magnitude of the risks involved. Under the circumstances, we find that Scott introduced sufficient evidence to satisfy Owens. [139 Mich App 671 .]
To summarize, a prima facie case of a design defect premised upon the omission of a safety device requires first a showing of the magnitude of foreseeable risks, including the likelihood of occurrence of the type of accident precipitating the need for the safety device and the severity of injuries sustainable from such an accident. It secondly requires a showing of alternative safety devices *188 and whether those devices would have been effective as a reasonable means of minimizing the foreseeable risk of danger. This latter showing may entail an evaluation of the alternative design in terms of its additional utility as a safety measure and its trade-offs against the costs and effective use of the product. See Prentis, supra, p 687, n 24.
In this case, the testimony provided by plaintiffs’ expert witness can be summarized as follows: Unexpected, spontaneous cycling of a power press, such as that resulting in this accident, occurs for unknown reasons in spite of good maintenance. It is an inevitable consequence of the operation of presses, and it is well known that such cycling causes numerous serious injuries in workplaces. Prior to the 1950 manufacture of the press in this case, technical literature, primarily generated in England, documented the availability of an interlocking barrier guard that soon thereafter became the norm in England, although not in the United States. This guard has a mechanical component interlocking with the clutch that locks the press ram in place and makes it "virtually impossible” for the press to cycle if the operator’s hands are in the way of the point of operation, i.e., the juncture where the cycling of the press causes the dies to come together. If the guard had been in place, the accident in this case would almost certainly have been avoided. This guard could have been installed on the press and could have been designed to be adjustable to the limited number of multiple purposes for which the press was designed. However, because the guard is integrated with the clutch mechanism, it is not practical for anyone other than the manufacturer to install the guard onto the mechanical working of the press. This pre *189 eludes fitting the machine with this particular type of guard after the press is acquired.
This evidence is sufficient to raise a question of fact for the jury. Although plaintiffs do lack a statistical breakdown of the risks of injuries caused by presses with and without interlocking barrier guards or a cost-accounting analysis of the incremental added costs (in 1950) if the design had been altered to include the guard, there was considerable evidence of the reasonableness of the design — that power presses in general are unsafe because of unavoidable cycling, i.e., the magnitude of the risks, and that the alternative design, the installation of the guard, would have prevented plaintiffs’ accident by precluding unexpected cycling of the press. In view of this evidence, we do not believe that statistical deficiencies in the expert testimony prevented plaintiffs from making a prima facie case.
Relying on
Villar v EW Bliss Co,
We conclude that a rational trier of fact could find for plaintiffs on a claim based on factual allegations of negligent design of the press. Therefore, the grant of a directed verdict was erroneous.
We do agree with defendants that Cincinnati was under no duty to place warnings on the press of this open and obvious danger. See Bullock, supra, pp 322-323. In the event of retrial, the question of failure to warn need not be submitted to the jury.
To the extent that liability against Addy-Morand, the alleged seller of the press, is premised upon a breach of warranty resulting from a defective design attributable to Cincinnati, our holding reversing the directed verdict and remanding for trial is applicable to Addy-Morand as well as Cincinnati. See Prentis, supra, p 693 ("When proceeding under a theory of implied warranty, a design defect is established by proof that the product is not reasonably safe for the uses intended, anticipated, or reasonably foreseeable. . . . For the sale of a product defective in such respect, the seller may be answerable for breach of an implied warranty.”). However, we find no evidence of independent negligence chargeable to Addy-Morand on the record.
Plaintiffs argue that the trial court erred by not excluding references to Reeves’ entitlement to retirement benefits. Should this issue recur in a retrial, we admonish the parties to adhere to foundational requirements for admission of evidence of Reeves’ entitlement to benefits for pur
*191
poses not prohibited by the collateral source rule. See
McMiddleton v Otis Elevator Co,
Reversed and remanded for trial.
