OPALA, Justice.
Two issues are presented on certiorari: (1) Did the trial court commit reversible error by instructing on a
res ipsa loquitur
pattern of proof? (2) Is there competent evidence to support the jury verdict? We answer the first question in the negative and the second in the affirmative.
I
THE ANATOMY OF THE LITIGATION
Nancy Qualls [Qualls] and a friend were in an automatic elevator in the Shawnee Medical Center [Hospital] on December 9, 1987 when the elevator fell from the second floor and stopped suddenly in the basement. Qualls claims to have suffered injuries to her back. She brought a tort action
against both the Hospital, which owned the automatic elevator, and United States Elevator Company [U.S. Elevator or the Company].
The latter manufactured, installed and undertook (by maintenance contract with the Hospital) to service, repair and maintain the elevator. Qualls alleged U.S. Elevator had defectively manufactured the product and the defendants (Hospital and U.S. Elevator) had negligently maintained it. The Hospital cross-claimed against U.S. Elevator for indemnity.
The trial court refused submission of the case on a plaintiff-pressed products liability theory, but allowed the claim to go to the jury against both defendants based on their negligence. Over defendants’ objections, the court instructed on the
res ipsa loqui-tur
pattern of proof.
Qualls prevailed
only against U.S. Elevator.
The verdict assessed her damages at $50,000.00. The trial court denied U.S. Elevator’s post-verdict motion for judgment notwithstanding the verdict [JNOV]
and entered judgment (a) for the Hospital (denying recovery) and (b) in Qualls’ favor against U.S. Elevator.
On appeal by U.S. Elevator, the lawyer-staffed division of the Court of Appeals reversed the trial court’s judgment on jury verdict and remanded the cause with directions to enter judgment for that entity. The appellate court concluded that (1) a
res ipsa loquitur
instruction was not warranted because Qualls failed to prove that the Company had
exclusive control
of the elevator when it fell and (2) Qualls failed to prove that U.S. Elevator’s want of due care directly caused her bodily harm. We granted certiorari and now reinstate and affirm the trial court’s judgment.
II.
CONTENTIONS ON CERTIORARI
Qualls urges on certiorari that the Court of Appeals erred
by requiring proof that an identifiable negligent act of U.S. Elevator proximately caused her injuries.
According to Qualls, she was entitled to rely upon a
res ipsa loquitur
pattern of proof. We are urged that whether U.S. Elevator had
exclusive control
of the elevator was a question of fact which the triers resolved in her favor.
U.S. Elevator asserts that because Qualls failed to prove her injuries resulted from an identifiable negligent act, she could not recover on a negligence theory, and since she
attempted
to show some specific negligent acts, she was barred from the benefit of
res ipsa loquitur.
According to U.S. Elevator, Qualls’ claim must fail because she did not prove that the elevator was in its exclusive control at the critical time.
III.
THE
RES IPSA LOQUITUR
PATTERN OF PROOF
Res ipsa
loquitur
is a pattern of proof which may be applied to an injury that does not occur in the usual course of everyday conduct unless a person who controls the instrumentality likely to produce injury fails to exercise due care to prevent its occurrence.
With the aid of
res ipsa loquitur
negligence may be inferred from the harm without the aid of circumstances pointing to the responsible human cause.
The fundamental element of this evidentia-ry process is the “control of the instrumentality” which caused the damage.
Whether a case is fit for the application of
res ipsa loquitur
presents a question of law; it is a judicial function to determine if a certain set of circumstances permits a given inference.
Among the
earliest
negligence plaintiffs to benefit from the evidentiary process introduced by
res ipsa loquitur
were
passengers in public transportation
conveyances
injured, while the appliance in which they were riding remained under the defendant’s management, in a course of unexplained events that, according to human experience, do not ordinarily happen if due care is exercised.
An automatic elevator’s sudden descent may raise a re-buttable inference of negligence under the
res ipsa loquitur
evidentiary process if the occurrence was due to some mechanism’s failure which would not ordinarily happen when due care is exercised in the appliance’s construction, installation and maintenance by the person charged with those responsibilities.
Elevator mechanisms are hidden from view, and since they consist of mechanical, electrical, and sophisticated electronic systems, they are at any rate not easily capable of manifesting a defect. Once the button is pressed, a rider has no control whatsoever over the events which follow. Even when, after the fact, experts are able to examine the physical
evidence, proof is not easy to come by. A defendant’s knowledge of the incident’s cause often would exceed, if not indeed supersede, that of the plaintiff.
In sum, while invocability of
res ipsa loquitur
must be assessed on the facts of each case,
its application to transportation appliances is not without a firm foundation in early and recent national
res ipsa
jurisprudence.
IV.
THE TRIAL COURT DID NOT COMMIT REVERSIBLE ERROR BY INSTRUCTING THE JURY ON A
RES IPSA LOQUITUR
PATTERN OF PROOF AND THERE IS COMPETENT EVIDENCE TO SUPPORT THE JURY VERDICT
U.S. Elevator concedes that the cause of Qualls’ bodily harm (if any) was the elevator’s descent from the second floor of the hospital into the basement.
In dispute
between the parties
is whether
(a)
Qualls’ proof to show the elevator in U.S. Elevator’s exclusive control is sufficient to support a res ipsa loquitur instruction
and (b)
there is competent evidence to support the jury verdict.
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OPALA, Justice.
Two issues are presented on certiorari: (1) Did the trial court commit reversible error by instructing on a
res ipsa loquitur
pattern of proof? (2) Is there competent evidence to support the jury verdict? We answer the first question in the negative and the second in the affirmative.
I
THE ANATOMY OF THE LITIGATION
Nancy Qualls [Qualls] and a friend were in an automatic elevator in the Shawnee Medical Center [Hospital] on December 9, 1987 when the elevator fell from the second floor and stopped suddenly in the basement. Qualls claims to have suffered injuries to her back. She brought a tort action
against both the Hospital, which owned the automatic elevator, and United States Elevator Company [U.S. Elevator or the Company].
The latter manufactured, installed and undertook (by maintenance contract with the Hospital) to service, repair and maintain the elevator. Qualls alleged U.S. Elevator had defectively manufactured the product and the defendants (Hospital and U.S. Elevator) had negligently maintained it. The Hospital cross-claimed against U.S. Elevator for indemnity.
The trial court refused submission of the case on a plaintiff-pressed products liability theory, but allowed the claim to go to the jury against both defendants based on their negligence. Over defendants’ objections, the court instructed on the
res ipsa loqui-tur
pattern of proof.
Qualls prevailed
only against U.S. Elevator.
The verdict assessed her damages at $50,000.00. The trial court denied U.S. Elevator’s post-verdict motion for judgment notwithstanding the verdict [JNOV]
and entered judgment (a) for the Hospital (denying recovery) and (b) in Qualls’ favor against U.S. Elevator.
On appeal by U.S. Elevator, the lawyer-staffed division of the Court of Appeals reversed the trial court’s judgment on jury verdict and remanded the cause with directions to enter judgment for that entity. The appellate court concluded that (1) a
res ipsa loquitur
instruction was not warranted because Qualls failed to prove that the Company had
exclusive control
of the elevator when it fell and (2) Qualls failed to prove that U.S. Elevator’s want of due care directly caused her bodily harm. We granted certiorari and now reinstate and affirm the trial court’s judgment.
II.
CONTENTIONS ON CERTIORARI
Qualls urges on certiorari that the Court of Appeals erred
by requiring proof that an identifiable negligent act of U.S. Elevator proximately caused her injuries.
According to Qualls, she was entitled to rely upon a
res ipsa loquitur
pattern of proof. We are urged that whether U.S. Elevator had
exclusive control
of the elevator was a question of fact which the triers resolved in her favor.
U.S. Elevator asserts that because Qualls failed to prove her injuries resulted from an identifiable negligent act, she could not recover on a negligence theory, and since she
attempted
to show some specific negligent acts, she was barred from the benefit of
res ipsa loquitur.
According to U.S. Elevator, Qualls’ claim must fail because she did not prove that the elevator was in its exclusive control at the critical time.
III.
THE
RES IPSA LOQUITUR
PATTERN OF PROOF
Res ipsa
loquitur
is a pattern of proof which may be applied to an injury that does not occur in the usual course of everyday conduct unless a person who controls the instrumentality likely to produce injury fails to exercise due care to prevent its occurrence.
With the aid of
res ipsa loquitur
negligence may be inferred from the harm without the aid of circumstances pointing to the responsible human cause.
The fundamental element of this evidentia-ry process is the “control of the instrumentality” which caused the damage.
Whether a case is fit for the application of
res ipsa loquitur
presents a question of law; it is a judicial function to determine if a certain set of circumstances permits a given inference.
Among the
earliest
negligence plaintiffs to benefit from the evidentiary process introduced by
res ipsa loquitur
were
passengers in public transportation
conveyances
injured, while the appliance in which they were riding remained under the defendant’s management, in a course of unexplained events that, according to human experience, do not ordinarily happen if due care is exercised.
An automatic elevator’s sudden descent may raise a re-buttable inference of negligence under the
res ipsa loquitur
evidentiary process if the occurrence was due to some mechanism’s failure which would not ordinarily happen when due care is exercised in the appliance’s construction, installation and maintenance by the person charged with those responsibilities.
Elevator mechanisms are hidden from view, and since they consist of mechanical, electrical, and sophisticated electronic systems, they are at any rate not easily capable of manifesting a defect. Once the button is pressed, a rider has no control whatsoever over the events which follow. Even when, after the fact, experts are able to examine the physical
evidence, proof is not easy to come by. A defendant’s knowledge of the incident’s cause often would exceed, if not indeed supersede, that of the plaintiff.
In sum, while invocability of
res ipsa loquitur
must be assessed on the facts of each case,
its application to transportation appliances is not without a firm foundation in early and recent national
res ipsa
jurisprudence.
IV.
THE TRIAL COURT DID NOT COMMIT REVERSIBLE ERROR BY INSTRUCTING THE JURY ON A
RES IPSA LOQUITUR
PATTERN OF PROOF AND THERE IS COMPETENT EVIDENCE TO SUPPORT THE JURY VERDICT
U.S. Elevator concedes that the cause of Qualls’ bodily harm (if any) was the elevator’s descent from the second floor of the hospital into the basement.
In dispute
between the parties
is whether
(a)
Qualls’ proof to show the elevator in U.S. Elevator’s exclusive control is sufficient to support a res ipsa loquitur instruction
and (b)
there is competent evidence to support the jury verdict.
Whether a defendant at the critical point in contest had “exclusive control” of an instrumentality in the
res ipsa loqui-tur
sense often constitutes a mixed question of law and fact. At the threshold the issue is one of law for the judge. It calls for the trial court to decide whether the evidence may lead reasonable persons to reach different conclusions.
If the proof is not so overwhelmingly one-sided as to make the control element a matter of law, the question must go to the jury.
Where there is
any
competent evidence to support the verdict, the judgment will be affirmed unless otherwise shown to be contrary to law.
U.S. Elevator, who manufactured, installed and undertook (by maintenance contract with the hospital) to service, repair and maintain the elevator, urges that
exclusive control
must be measured by
ownership
and
management
of the instrumentality causing the injury and argues that an entity responsible for its service, maintenance and repair lacks the
critical control
which would entitle plaintiff to rely on a
res ipsa loquitur
pattern to prove the maintenance contractor’s negligence.
A narrow reading of the “exclusive control” element U.S. Elevator advances for our adoption would confine
res ipsa
to cases where there is but one defendant.
Exclusive control,
which is a flexible concept with a much broader scope than that urged by the Company, does no more than eliminate, within reason, all explanations for the injurious event other than the defendant’s negligence
— i.e., it shows that defendant’s negligence
probably
caused the accident.
The term implies
more than actual possession and use at the time of the occurrence. The required control element may be shifted and, under some circumstances, it may be shared.
In short, control may rest in
one who assumes responsibility for the fitness of an instrumentality for its intended use
If an elevator is covered by a maintenance agreement, the ambit of a
maintenance contractor’s duty to third persons may be measured by the nature and scope of its contractual undertaking.
The contract in this case provides that the Company will maintain the elevator, using skilled, trained personnel, supervised and directly employed by the Company, and
that it will regularly and systematically examine, adjust, lubricate, and repair or replace the
machinery.
According to U.S. Elevator exclusive control as a matter of law must be found to have been exercised
only
by the Hospital. This is urged because hospital employees (a) rode the elevator once a day to inspect its operation, (b) had, on occasion, added oil to the elevator reservoir, and (c) called U.S. Elevator if service (other than a monthly routine service call) was needed.
The triers may have surmised that even with the Hospital’s daily inspection ride, its employees could not have discovered any more about the elevator’s defects than any other passenger. If the hospital had discovered a malfunction, it could do no more than notify the Company. No evidence is present in the record before us to show that the Hospital had discovered a malfunction in time to prevent the elevator’s harm-dealing fall or sudden descent. We hence find the proof sufficient to support the triers’ reasonable inference that the Hospital and its employees — much like other passengers — were completely dependent upon U.S. Elevator for the appliance’s safe operation.
Qualls first claimed that the elevator was under the exclusive control of the Hospital and then asserted that by virtue of the service contract the instrumentality was under U.S. Elevator’s
exclusive control.
These inconsistent versions, U.S. Elevator urges, support
its
position that neither defendant actually had exclusive control, and that the
res ipsa loquitur
instruction was improperly included.
The trial court charged the triers that the
res ipsa loquitur
pattern of proof would permit them to find either
the Hospital
or
U.S. Elevator had exclusive control of the harm-dealing elevator. Our pleading regime does not require Qualls to choose at her peril between two alternative fact versions — one that would place exclusive control in the Hospital and the other in U.S. Elevator. When the current Pleading Code was adopted in 1984, Oklahoma’s legal system irreversibly passed from the fact pleading regime of yesteryear to the present federal notice pleading variety.
Current law does not require a party to make a presubmission election that would embrace a single version -of consistent facts.
While inconsistent judgments and double recovery cannot be allowed, a party is not prevented from prosecuting a claim based on two or more alternative fact versions.
Because Hospital employees’ daily use of the elevator and their duty to report any malfunction to U.S. Elevator
did not,
as a matter of law,
divest U.S. Elevator of exclusive control,
the triers could have found that at the critical time in question
either
the Hospital
or
U.S. Elevator had exclusive control of the instrumentality. The proof adduced at
nisi prius
clearly supports the court’s
res ipsa loquitur
charge and there
is competent evidence to support the verdict.
V.
NO
PROOF OF SPECIFIC NEGLIGENT ACTS WHICH DIRECTLY CAUSED THE ELEVATOR’S FALL WAS ADDUCED DURING THE TRIAL
U.S. Elevator claims error in allowing Qualls to prove the elevator’s descent was caused by specific acts of negligence. It is urged that this made a
res ipsa loquitur
instruction impermissible.
No specific cause of the elevator’s rapid and unexpected December 9 descent or its fall to the basement was alleged.
No proof of specific negligent acts which directly caused this occurrence was adduced at trial; nor was its introduction
ever attempt
ed:
We hence postpone to another day a pronouncement on what U.S. Elevator perceives as an
impermissible combination,
outside the context of medical malpractice litigation,
of two incompatible methods for proving negligence
— reliance on specific acts of want of due care and concurrent dependence on
res ipsa
evidentiary process.
SUMMARY
The trial court did not err by instructing the jury on the
res ipsa loquitur
pattern of proof, nor by denying the Company’s quest for directed verdict or its judgment notwithstanding the verdict. The verdict which finds the Company liable
qua
maintenance provider while exonerating the Hospital as owner and manager, is supported by competent evidence.
THE COURT OF APPEALS’ OPINION IS VACATED; THE TRIAL COURT’S JUDGMENT IS REINSTATED AND AFFIRMED.
LAVENDER, V.C.J., and HARGRAVE ALMA WILSON, KAUGER, SUMMERS and WATT, JJ., concur.
HODGES, C.J., dissents.
SIMMS, JJ., concurs in part and dissents in part.